chore(package): update eslint to version 6.8.0

Closes #40

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "commitizen": "3.0.5",
     "coveralls": "3.0.1",
     "cz-conventional-changelog": "2.1.0",
-    "eslint": "4.19.1",
+    "eslint": "6.8.0",
     "eslint-config-luanmuniz": "0.2.1",
     "eslint-plugin-import": "2.12.0",
     "eslint-plugin-jest": "21.27.1",