chore(package): update standard to version 13.0.1 (#13)

Author: greenkeeper[bot]

package.json

@@ -38,6 +38,6 @@
   "devDependencies": {
     "jest-cli": "^23.6.0",
     "semantic-release": "^15.11.0",
-    "standard": "^12.0.1"
+    "standard": "^13.0.1"
   }
 }