chore(package): update eslint to version 6.6.0

Closes #42

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "@babel/preset-react": "^7.0.0",
     "babel-eslint": "^10.0.1",
     "babel-minify": "^0.5.0",
-    "eslint": "^5.12.0",
+    "eslint": "^6.6.0",
     "eslint-config-airbnb": "^17.1.0",
     "eslint-config-prettier": "^3.3.0",
     "eslint-plugin-import": "^2.14.0",