CHANGELOG: add aomedia:3325

Bug: aomedia:3313
Change-Id: I0c4b948730a184c2faa5db9242f0f79a87ac72bb
diff --git a/CHANGELOG b/CHANGELOG
index 853c70b..ac9d532 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -59,6 +59,7 @@
       --enable-tx-size-search will be ignored in non-rd pick mode
     * aomedia:3304 Fix off-by-one error of max w/h in validate_config
     * aomedia:3306 Do not use pthread_setname_np on GNU/Hurd
+    * aomedia:3325 row-multithreading produces invalid bitstream in some cases
     * compiler_flags.cmake: fix flag detection w/cmake 3.17-3.18.2
     * tools/*.py: update to python3
     * aom_configure.cmake: detect PIE and set CONFIG_PIC