chore(package): update eslint to version 6.7.1

Closes #155

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "babel-preset-airbnb": "^2.5.3",
     "chai": "^4.2.0",
     "cheerio": "^1.0.0-rc.3",
-    "eslint": "^5.16.0",
+    "eslint": "^6.7.1",
     "eslint-config-airbnb-base": "^13.1.0",
     "eslint-plugin-import": "^2.17.3",
     "in-publish": "^2.0.0",