chore(package): update eslint to version 6.7.0

Closes #124

Author: greenkeeper[bot]

package.json

@@ -91,7 +91,7 @@
     "chai": "3.5.0",
     "coveralls": "3.0.0",
     "documentation": "5.3.3",
-    "eslint": "4.4.1",
+    "eslint": "6.7.0",
     "eslint-config-wework": "3.0.0",
     "eslint-friendly-formatter": "2.0.7",
     "express": "4.16.2",