fix: external tslint running on library source code (#35)

Author: smithad15

index.d.ts

@@ -69,7 +69,6 @@
     "prepublish": "npm run build"
   },
   "main": "dist/source/index.js",
-  "typings": "source/index",
   "repository": "https://github.com/angular-redux/form",
   "license": "MIT"
 }