chore(package): update eslint to version 6.7.1

Closes #752

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "diacritics": "1.3.0",
     "esdoc": "1.1.0",
     "esdoc-standard-plugin": "1.0.0",
-    "eslint": "6.5.0",
+    "eslint": "6.7.1",
     "format-number": "3.0.0",
     "grunt": "^1.0.1",
     "grunt-cli": "1.3.2",