chore(package): update standard to version 13.0.1

Closes #16

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "gulp-nsp": "^2.1.0",
     "gulp-plumber": "^1.0.0",
     "gulp-standard": "^11.0.0",
-    "standard": "^11.0.0",
+    "standard": "^13.0.1",
     "yeoman-assert": "^3.0.0",
     "yeoman-test": "^1.6.0"
   },