fixed resolution of types for main module

Author: bondom

package.json

@@ -3,6 +3,7 @@
   "version": "1.3.4",
   "description": "Validate react form components, based on their state",
   "main": "build/index.js",
+  "types": "build/index.d.ts",
   "scripts": {
     "dev": "watch 'npm run build' src",
     "build": "babel src -d build && babel types -d build --copy-files",