TS: fixed package.json to refer to main module file

Author: adumesny

package.json

@@ -2,8 +2,8 @@
   "name": "gridstack",
   "version": "2.0.0-rc2",
   "description": "TypeScript/Javascript lib for dashboard layout and creation, no external dependencies, with many wrappers (React, Angular, Ember, knockout...)",
-  "main": "./dist/index.js",
-  "typings": "./dist/index.d.ts",
+  "main": "./dist/gridstack.js",
+  "typings": "./dist/gridstack.d.ts",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/gridstack/gridstack.js.git"