chore(package): update eslint to version 6.7.0

Closes #64

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "babel-plugin-transform-replace-object-assign": "^2.0.0",
     "babel-preset-airbnb": "^4.0.1",
     "chai": "^4.2.0",
-    "eslint": "^5.16.0",
+    "eslint": "^6.7.0",
     "eslint-config-airbnb": "^17.1.1",
     "eslint-plugin-import": "^2.18.2",
     "eslint-plugin-jsx-a11y": "^6.2.3",