chore(package): update standard to version 13.1.0

Closes #16

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-stage-3": "^6.24.1",
     "fixpack": "^2.3.1",
-    "standard": "^11.0.0"
+    "standard": "^13.1.0"
   },
   "files": [
     "lib"