Document more codec controls added in v3.3.0

Bug: aomedia:3223
Change-Id: I0ca54016d88ec000b94e36b9f9a1266dd365240c

CHANGELOG

diff --git a/CHANGELOG b/CHANGELOG
index cbfc41b..ffc1177 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -9,7 +9,10 @@
     * Add --deltaq-strength
     * rtc: Allow scene-change and overshoot detection for svc
     * rtc: Intra-only frame for svc
-    * AV1 RT: CDEF control option to disable CDEF on non-ref frames
+    * AV1 RT: Option 2 for codec control AV1E_SET_ENABLE_CDEF to disable
+      CDEF on non-ref frames
+    * New codec controls AV1E_SET_LOOPFILTER_CONTROL and
+      AOME_GET_LOOPFILTER_LEVEL
     * Improvements to three pass encoding
 
   - Compression Efficiency Improvements