chore(package): update eslint to version 6.6.0

Closes #65

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "chai": "^4.1.2",
     "enzyme": "^3.4.1",
     "enzyme-adapter-react-helper": "^1.3.0",
-    "eslint": "^5.3.0",
+    "eslint": "^6.6.0",
     "eslint-config-airbnb": "^17.1.0",
     "eslint-plugin-import": "^2.14.0",
     "eslint-plugin-jsx-a11y": "^6.1.1",