Update help URL to avoid redirect.

src/org/thoughtcrime/securesms/ConversationListActivity.java

@@ -286,7 +286,7 @@ public class ConversationListActivity extends PassphraseRequiredActionBarActivit
 
   private void handleHelp() {
     try {
-      startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://support.whispersystems.org")));
+      startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://support.signal.org")));
     } catch (ActivityNotFoundException e) {
       Toast.makeText(this, R.string.ConversationListActivity_there_is_no_browser_installed_on_your_device, Toast.LENGTH_LONG).show();
     }