fix(package): update eslint to version 6.5.0

Closes #84

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "config": "~3.0.0",
     "debug": "~4.1.0",
     "del": "~3.0.0",
-    "eslint": "~5.9.0",
+    "eslint": "~6.5.0",
     "frep": "~0.2.3",
     "fs-extra": "~7.0.1",
     "gulp": "~4.0.0",