Fixes typo on variable 'required'

HenrikWM · HenrikWM · commit 58af1542cc2a · 2019-02-08T14:09:09.000+01:00
`require` is undefined. This corrects the spelling of the variable that is used to call `_revokeAccessTokenInternal()`
diff --git a/src/UserManager.js b/src/UserManager.js
@@ -478,7 +478,7 @@ export class UserManager extends OidcClient {
             var access_token = user.access_token;
             var refresh_token = user.refresh_token;
 
-            return this._revokeAccessTokenInternal(access_token, require)
+            return this._revokeAccessTokenInternal(access_token, required)
                 .then(atSuccess => {
                     return this._revokeRefreshTokenInternal(refresh_token, required)
                         .then(rtSuccess => {
