chore(package): update standard to version 13.1.0

Closes #42

Author: greenkeeper[bot]

package.json

@@ -77,7 +77,7 @@
     "rollup": "^0.48.0",
     "rollup-plugin-babel": "^2.7.1",
     "semantic-release": "^7.0.1",
-    "standard": "^10.0.0",
+    "standard": "^13.1.0",
     "uglify-js": "^3.0.0"
   },
   "standard": {