chore(package): update pify to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "karma-phantomjs-launcher": "^1.0.4",
     "nyc": "^15.0.0",
     "p-event": "^4.1.0",
-    "pify": "^4.0.0",
+    "pify": "^5.0.0",
     "postcss": "^7.0.0",
     "postcss-import": "^12.0.0",
     "postcss-mixins": "^6.0.1",