chore(package): update eslint to version 6.7.0

Closes #72

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "devDependencies": {
         "babel-eslint": "^8.2.6",
         "chai": "^4.1.2",
-        "eslint": "~5.0.1",
+        "eslint": "~6.7.0",
         "eslint-plugin-react": "~7.10.0",
         "lint-staged": "^7.0.3",
         "mocha": "^5.0.5",