chore(package): update eslint to version 6.7.0

Closes #8

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "enzyme": "^3.1.0",
     "enzyme-adapter-react-16": "^1.0.2",
     "enzyme-to-json": "^3.1.4",
-    "eslint": "^4.11.0",
+    "eslint": "^6.7.0",
     "eslint-config-airbnb": "^16.1.0",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",