chore(package): update gzip-size to version 5.1.1

Closes #189

Author: greenkeeper[bot]

package.json

@@ -92,7 +92,7 @@
     "commitizen": "3.0.5",
     "cross-var": "1.1.0",
     "cz-conventional-changelog": "2.1.0",
-    "gzip-size": "5.0.0",
+    "gzip-size": "5.1.1",
     "husky": "1.3.0",
     "jest": "23.6.0",
     "jest-watch-typeahead": "0.2.0",