Update doc/changes.src

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
diff --git a/doc/changes.src b/doc/changes.src
index e48aa5d..c8d2403 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -60,6 +60,7 @@
 \b An undefined local macro (\c{%$}) no longer matches a global macro
   with the same name.
 
+\b Fix NULL dereference on too long local labels.
 
 \S{cl-2.07} Version 2.07