Update microbundle and rebuild

Author: developit

package.json

@@ -30,6 +30,6 @@
     "eslint": "^4.16.0",
     "eslint-config-developit": "^1.1.1",
     "karmatic": "^1.0.6",
-    "microbundle": "^0.4.2"
+    "microbundle": "^0.4.3"
   }
 }