update dev script

Author: jscottsmith

package.json

@@ -8,7 +8,7 @@
   },
   "main": "lib/index.js",
   "scripts": {
-    "dev": "jest && webpack --progress --colors --watch",
+    "dev": "yarn test && webpack --progress --colors --watch",
     "dev-server": "node ./example/dist/server",
     "gh-pages": "NODE_ENV=production webpack --progress --colors",
     "test": "BABEL_ENV=test jest",