diff --git a/package-lock.json b/package-lock.json
index 5308d61..01f8d73 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -126,6 +126,25 @@
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+					"resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
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+			"dev": true
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+			"resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+			"integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
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+			"resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.0.4.tgz",
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+					"integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+					"dev": true,
+					"requires": {
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+					"dev": true,
+					"requires": {
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 			"integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
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@@ -649,6 +936,16 @@
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@@ -712,6 +1018,12 @@
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+			"resolved": "https://registry.npmjs.org/default-resolution/-/default-resolution-2.0.0.tgz",
+			"integrity": "sha1-vLgrqnKtebQmp2cy8aga1t8m1oQ=",
+			"dev": true
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+		"define-properties": {
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+			"resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
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 			"dev": true,
 			"requires": {
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 		"define-property": {
@@ -804,12 +1139,6 @@
 			"integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
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@@ -889,6 +1218,16 @@
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+			"resolved": "https://registry.npmjs.org/each-props/-/each-props-1.3.2.tgz",
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@@ -900,23 +1239,43 @@
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-			"integrity": "sha1-jhdyBsPICDfYVjLouTWd/osvbq8=",
+			"version": "1.4.1",
+			"resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
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-					"dev": true,
-					"requires": {
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+				"once": "^1.4.0"
+			}
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+			"resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
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+			"dev": true,
+			"requires": {
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+			"resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.46.tgz",
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+			"dev": true,
+			"requires": {
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+				"es6-symbol": "~3.1.1",
+				"next-tick": "1"
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+		"es6-iterator": {
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+			"resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
+			"integrity": "sha1-p96IkUGgWpSwhUQDstCg+/qY87c=",
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@@ -925,6 +1284,28 @@
 			"integrity": "sha1-lu258v2wGZWCKyY92KratnSBgbw=",
 			"dev": true
 		},
+		"es6-symbol": {
+			"version": "3.1.1",
+			"resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.1.tgz",
+			"integrity": "sha1-vwDvT9q2uhtG7Le2KbTH7VcVzHc=",
+			"dev": true,
+			"requires": {
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+			"resolved": "https://registry.npmjs.org/es6-weak-map/-/es6-weak-map-2.0.2.tgz",
+			"integrity": "sha1-XjqzIlH/0VOKH45f+hNXdy+S2W8=",
+			"dev": true,
+			"requires": {
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@@ -1440,11 +1821,15 @@
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-			"integrity": "sha1-Z101iyyjiS15Whq0cjL4tuLg3eQ=",
-			"dev": true
+		"find-up": {
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+			"resolved": "https://registry.npmjs.org/find-up/-/find-up-1.1.2.tgz",
+			"integrity": "sha1-ay6YIrGizgpgq2TWEOzK1TyyTQ8=",
+			"dev": true,
+			"requires": {
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@@ -1495,6 +1880,16 @@
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 		},
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+			"resolved": "https://registry.npmjs.org/flush-write-stream/-/flush-write-stream-1.0.3.tgz",
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@@ -1536,6 +1931,16 @@
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+			"integrity": "sha1-C3gV/DIBxqaeFNuYzgmMFpNSWes=",
+			"dev": true,
+			"requires": {
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@@ -1554,21 +1959,553 @@
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-			"integrity": "sha1-QLcJU30k0dRXZ9takIaJ3+aaxE8=",
+		"fsevents": {
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+					"integrity": "sha1-3mMSg3P8v3w8z6TeWkgMRaZ5WOs=",
+					"dev": true
+				},
+				"vinyl": {
+					"version": "2.2.0",
+					"resolved": "https://registry.npmjs.org/vinyl/-/vinyl-2.2.0.tgz",
+					"integrity": "sha512-MBH+yP0kC/GQ5GwBqrTPTzEfiiLjta7hTtvQtbxBgTeSXsmKQRQecjibMbxIXzVT3Y9KJK+drOz1/k+vsu8Nkg==",
 					"dev": true,
 					"requires": {
-						"core-util-is": "~1.0.0",
-						"inherits": "~2.0.1",
-						"isarray": "0.0.1",
-						"string_decoder": "~0.10.x"
+						"clone": "^2.1.1",
+						"clone-buffer": "^1.0.0",
+						"clone-stats": "^1.0.0",
+						"cloneable-readable": "^1.0.0",
+						"remove-trailing-separator": "^1.0.1",
+						"replace-ext": "^1.0.0"
 					}
+				}
+			}
+		},
+		"vinyl-sourcemap": {
+			"version": "1.1.0",
+			"resolved": "https://registry.npmjs.org/vinyl-sourcemap/-/vinyl-sourcemap-1.1.0.tgz",
+			"integrity": "sha1-kqgAWTo4cDqM2xHYswCtS+Y7PhY=",
+			"dev": true,
+			"requires": {
+				"append-buffer": "^1.0.2",
+				"convert-source-map": "^1.5.0",
+				"graceful-fs": "^4.1.6",
+				"normalize-path": "^2.1.1",
+				"now-and-later": "^2.0.0",
+				"remove-bom-buffer": "^3.0.0",
+				"vinyl": "^2.0.0"
+			},
+			"dependencies": {
+				"clone": {
+					"version": "2.1.2",
+					"resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
+					"integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18=",
+					"dev": true
 				},
-				"string_decoder": {
-					"version": "0.10.31",
-					"resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-					"integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+				"clone-stats": {
+					"version": "1.0.0",
+					"resolved": "https://registry.npmjs.org/clone-stats/-/clone-stats-1.0.0.tgz",
+					"integrity": "sha1-s3gt/4u1R04Yuba/D9/ngvh3doA=",
 					"dev": true
 				},
-				"through2": {
-					"version": "0.6.5",
-					"resolved": "https://registry.npmjs.org/through2/-/through2-0.6.5.tgz",
-					"integrity": "sha1-QaucZ7KdVyCQcUEOHXp6lozTrUg=",
-					"dev": true,
-					"requires": {
-						"readable-stream": ">=1.0.33-1 <1.1.0-0",
-						"xtend": ">=4.0.0 <4.1.0-0"
-					}
+				"replace-ext": {
+					"version": "1.0.0",
+					"resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-1.0.0.tgz",
+					"integrity": "sha1-3mMSg3P8v3w8z6TeWkgMRaZ5WOs=",
+					"dev": true
 				},
 				"vinyl": {
-					"version": "0.4.6",
-					"resolved": "https://registry.npmjs.org/vinyl/-/vinyl-0.4.6.tgz",
-					"integrity": "sha1-LzVsh6VQolVGHza76ypbqL94SEc=",
+					"version": "2.2.0",
+					"resolved": "https://registry.npmjs.org/vinyl/-/vinyl-2.2.0.tgz",
+					"integrity": "sha512-MBH+yP0kC/GQ5GwBqrTPTzEfiiLjta7hTtvQtbxBgTeSXsmKQRQecjibMbxIXzVT3Y9KJK+drOz1/k+vsu8Nkg==",
 					"dev": true,
 					"requires": {
-						"clone": "^0.2.0",
-						"clone-stats": "^0.0.1"
+						"clone": "^2.1.1",
+						"clone-buffer": "^1.0.0",
+						"clone-stats": "^1.0.0",
+						"cloneable-readable": "^1.0.0",
+						"remove-trailing-separator": "^1.0.1",
+						"replace-ext": "^1.0.0"
 					}
 				}
 			}
@@ -5219,12 +6489,59 @@
 				"isexe": "^2.0.0"
 			}
 		},
+		"which-module": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/which-module/-/which-module-1.0.0.tgz",
+			"integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8=",
+			"dev": true
+		},
 		"wordwrap": {
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
 			"integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
 			"dev": true
 		},
+		"wrap-ansi": {
+			"version": "2.1.0",
+			"resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+			"integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+			"dev": true,
+			"requires": {
+				"string-width": "^1.0.1",
+				"strip-ansi": "^3.0.1"
+			},
+			"dependencies": {
+				"is-fullwidth-code-point": {
+					"version": "1.0.0",
+					"resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+					"integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+					"dev": true,
+					"requires": {
+						"number-is-nan": "^1.0.0"
+					}
+				},
+				"string-width": {
+					"version": "1.0.2",
+					"resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+					"integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+					"dev": true,
+					"requires": {
+						"code-point-at": "^1.0.0",
+						"is-fullwidth-code-point": "^1.0.0",
+						"strip-ansi": "^3.0.0"
+					}
+				},
+				"strip-ansi": {
+					"version": "3.0.1",
+					"resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+					"integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+					"dev": true,
+					"requires": {
+						"ansi-regex": "^2.0.0"
+					}
+				}
+			}
+		},
 		"wrap-promise": {
 			"version": "1.0.1",
 			"resolved": "https://registry.npmjs.org/wrap-promise/-/wrap-promise-1.0.1.tgz",
@@ -5260,6 +6577,73 @@
 			"resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
 			"integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
 			"dev": true
+		},
+		"y18n": {
+			"version": "3.2.1",
+			"resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+			"integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+			"dev": true
+		},
+		"yargs": {
+			"version": "7.1.0",
+			"resolved": "https://registry.npmjs.org/yargs/-/yargs-7.1.0.tgz",
+			"integrity": "sha1-a6MY6xaWFyf10oT46gA+jWFU0Mg=",
+			"dev": true,
+			"requires": {
+				"camelcase": "^3.0.0",
+				"cliui": "^3.2.0",
+				"decamelize": "^1.1.1",
+				"get-caller-file": "^1.0.1",
+				"os-locale": "^1.4.0",
+				"read-pkg-up": "^1.0.1",
+				"require-directory": "^2.1.1",
+				"require-main-filename": "^1.0.1",
+				"set-blocking": "^2.0.0",
+				"string-width": "^1.0.2",
+				"which-module": "^1.0.0",
+				"y18n": "^3.2.1",
+				"yargs-parser": "^5.0.0"
+			},
+			"dependencies": {
+				"is-fullwidth-code-point": {
+					"version": "1.0.0",
+					"resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+					"integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+					"dev": true,
+					"requires": {
+						"number-is-nan": "^1.0.0"
+					}
+				},
+				"string-width": {
+					"version": "1.0.2",
+					"resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+					"integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+					"dev": true,
+					"requires": {
+						"code-point-at": "^1.0.0",
+						"is-fullwidth-code-point": "^1.0.0",
+						"strip-ansi": "^3.0.0"
+					}
+				},
+				"strip-ansi": {
+					"version": "3.0.1",
+					"resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+					"integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+					"dev": true,
+					"requires": {
+						"ansi-regex": "^2.0.0"
+					}
+				}
+			}
+		},
+		"yargs-parser": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0.tgz",
+			"integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
+			"dev": true,
+			"requires": {
+				"camelcase": "^3.0.0"
+			}
 		}
 	}
 }
diff --git a/package.json b/package.json
index 70dff8b..f86ec0b 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
 		"coveralls": "^3.0.2",
 		"eslint": "^5.8.0",
 		"eslint-config-cortys": "1.x",
-		"gulp": "3.9.1",
+		"gulp": "4.0.0",
 		"gulp-eslint": "^5.0.0",
 		"gulp-gh-pages": "0.5.4",
 		"gulp-istanbul": "^1.1.3",