chore(package): update eslint to version 6.6.0

Closes #38

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
     "babel-jest": "^23.0.0",
     "babel-preset-minify": "^0.4.0",
     "codecov": "^3.0.2",
-    "eslint": "^5.0.1",
+    "eslint": "^6.6.0",
     "eslint-config-airbnb-base": "^13.0.0",
     "eslint-plugin-import": "^2.13.0",
     "husky": "^0.14.3",