Update OAuth20GetAccessToken.java

Add `users.read` to token's scope.

Author: zacmos

examples/src/main/java/com/twitter/clientlib/auth/OAuth20GetAccessToken.java

@@ -73,7 +73,7 @@ public OAuth2AccessToken getAccessToken(TwitterCredentialsOAuth2 credentials) {
         credentials.getTwitterOauth2ClientId(),
         credentials.getTwitterOAuth2ClientSecret(),
         "http://twitter.com",
-        "offline.access tweet.read");
+        "offline.access tweet.read users.read");
 
     OAuth2AccessToken accessToken = null;
     try {