fix: module and types file links in package.json (#151)

Now files in this directories are under src folder
Not sure if it's supposed to or it's an overlook
Anyway it's better to fix this quick

Author: saitonakamura

package.json

@@ -56,8 +56,8 @@
   ],
   "license": "MIT",
   "main": "lib/js/index.js",
-  "module": "lib/es/index.js",
-  "types": "typings/index.d.ts",
+  "module": "lib/es/src/index.js",
+  "types": "typings/src/index.d.ts",
   "peerDependencies": {
     "react": "^16.3.2",
     "react-dom": "^16.3.2"