Merge pull request #735 from jitsi/fix_typo

Fixes typo

modules/UI/authentication/AuthHandler.js

 function requestAuth(roomName, connect) {
     if (isTokenAuthEnabled) {
         // This Promise never resolves as user gets redirected to another URL
-        return new Promse(function (resolve, reject) {
+        return new Promise(function (resolve, reject) {
             redirectToTokenAuthService(roomName);
         });
     } else {