chore(package): update np to version 2.13.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -63,7 +63,7 @@
     "eslint-plugin-standard": "^2.0.1",
     "execa": "^0.6.0",
     "husky": "^0.13.0",
-    "np": "^2.12.0",
+    "np": "^2.13.0",
     "nyc": "^10.1.2",
     "posthtml-bem": "^0.2.2",
     "posthtml-css-modules": "^0.1.1",