chore(package): update eslint to version 6.7.2

Closes #104

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "babel-loader": "^8.0.4",
     "codemirror": "^5.37.0",
     "css-loader": "^3.0.0",
-    "eslint": "^5.7.0",
+    "eslint": "^6.7.2",
     "eslint-config-airbnb-base": "^13.1.0",
     "eslint-config-prettier": "^5.0.0",
     "eslint-plugin-import": "^2.11.0",