Update CHANGELOG for 7.12.2

CHANGELOG

@@ -10,7 +10,7 @@ v 7.13.0 (unreleased)
   - Update ssl_ciphers in Nginx example to remove DHE settings. This will deny forward secrecy for Android 2.3.7, Java 6 and OpenSSL 0.9.8
   - Convert CRLF newlines to LF when committing using the web editor.
-v 7.12.2 (unreleased)
+v 7.12.2
   - Correctly show anonymous authorized applications under Profile > Applications.
 v 7.12.1