diff --git a/package-lock.json b/package-lock.json
index 82985fe..25b8f46 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -124,7 +124,8 @@
     "acorn": {
       "version": "2.7.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz",
-      "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc="
+      "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc=",
+      "optional": true
     },
     "acorn-globals": {
       "version": "1.0.9",
@@ -728,7 +729,8 @@
     "cssom": {
       "version": "0.3.8",
       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
-      "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg=="
+      "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg==",
+      "optional": true
     },
     "cssstyle": {
       "version": "0.2.37",
@@ -2019,9 +2021,9 @@
       "dev": true
     },
     "normalize-url": {
-      "version": "4.5.0",
-      "resolved": "https://registry.npmjs.org/normalize-url/-/normalize-url-4.5.0.tgz",
-      "integrity": "sha512-2s47yzUxdexf1OhyRi4Em83iQk0aPvwTddtFz4hnSSw9dCEsLEGf6SwIO8ss/19S9iBb5sJaOuTvTGDeZI00BQ==",
+      "version": "4.5.1",
+      "resolved": "https://registry.npmjs.org/normalize-url/-/normalize-url-4.5.1.tgz",
+      "integrity": "sha512-9UZCFRHQdNrfTpGg8+1INIg93B6zE0aXMVFkw1WFwvO4SlZywU6aLg5Of0Ap/PgcbSw4LNxvMWXMeugwMCX0AA==",
       "dev": true
     },
     "nth-check": {
@@ -2141,7 +2143,8 @@
     "prelude-ls": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
-      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ="
+      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
+      "optional": true
     },
     "prepend-http": {
       "version": "2.0.0",
@@ -2731,6 +2734,7 @@
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "optional": true,
       "requires": {
         "prelude-ls": "~1.1.2"
       }