chore(package): update eslint to version 6.2.2

Closes #14

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "babel-eslint": "^8.2.5",
     "babel-plugin-transform-class-properties": "^6.24.1",
     "babel-preset-env": "^1.7.0",
-    "eslint": "^4.8.0",
+    "eslint": "^6.2.2",
     "eslint-config-airbnb": "^16.0.0",
     "eslint-plugin-import": "^2.13.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",