chore(package): update @neogeek/eslint-config-standards to version 1.15.0

Closes #8

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -13,7 +13,7 @@
     "markdown-it": "8.3.0"
   },
   "devDependencies": {
-    "@neogeek/eslint-config-standards": "1.13.1",
+    "@neogeek/eslint-config-standards": "1.15.0",
     "eslint": "3.18.0"
   },
   "peerDependencies": {