export fix

Author: chrisallo

package.json

@@ -1,5 +1,5 @@
 {
-  "version": "4.0.0-beta-1",
+  "version": "4.0.0-beta-2",
   "description": "Sendbird SDK for JavaScript",
   "name": "@sendbird/chat",
   "author": "Sendbird <support@sendbird.com>",
@@ -20,6 +20,7 @@
   "main": "bundles/sendbird.js",
   "types": "types/index.d.ts",
   "exports": {
+    ".": "./bundles/sendbird.js",
     "./message": "./bundles/message.js",
     "./groupChannel": "./bundles/groupChannel.js",
     "./openChannel": "./bundles/openChannel.js"