doc/changes.src: Restore empty line.

Due to previous commit empty line was occasionally
removed which make text harder to read. Restore it.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
diff --git a/doc/changes.src b/doc/changes.src
index c8d2403..1d98a07 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -62,6 +62,7 @@
 
 \b Fix NULL dereference on too long local labels.
 
+
 \S{cl-2.07} Version 2.07
 
 \b NASM is now under the 2-clause BSD license.  See \k{legal}.