fix(): change exit code on npm test cmd

Author: crobinson42

package.json

@@ -8,7 +8,7 @@
     "url": "https://github.com/crobinson42/react-skeleton-css"
   },
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "echo \"Error: no test specified\" && exit 0",
     "dev": "webpack-dev-server --hot --watch",
     "semantic-release": "semantic-release pre && npm publish && semantic-release post"
   },