chore(package): update npmpub to version 4.0.1

Closes #6

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "cssnano": "^3.9.1",
     "del-cli": "^0.2.1",
     "http-server": "^0.9.0",
-    "npmpub": "^3.1.0",
+    "npmpub": "^4.0.1",
     "postcss-cli": "^2.6.0",
     "postcss-cssnext": "^2.9.0",
     "postcss-import": "^9.0.0",