moved main js file from lib dir

Author: Stefania

package.json

@@ -3,7 +3,7 @@
   "version": "0.0.2",
   "license": "GPLv3",
   "description": "JS module providing Arduino Create Cloud Connection",
-  "main": "./src/index.js",
+  "main": "lib/index.js",
   "module": "es/index.js",
   "jsnext:main": "es/index.js",
   "files": [