chore(package): update eslint to version 6.7.1

Closes #24

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "babel-runtime": "^6.26.0",
     "cross-env": "^5.2.0",
     "css-loader": "^1.0.0",
-    "eslint": "^5.2.0",
+    "eslint": "^6.7.1",
     "eslint-config-airbnb": "^17.0.0",
     "eslint-plugin-babel": "^5.1.0",
     "eslint-plugin-flowtype": "^2.50.0",