chore(package): update eslint to version 6.0.1

Closes #128

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "cross-env": "^5.2.0",
     "esdoc": "1.1.0",
     "esdoc-standard-plugin": "1.0.0",
-    "eslint": "5.7.0",
+    "eslint": "6.0.1",
     "eslint-config-standard": "^12.0.0",
     "eslint-plugin-import": "^2.14.0",
     "eslint-plugin-node": "^7.0.1",