Add CHANGELOG entry for multi exec

Author: sharkdp

CHANGELOG.md

@@ -5,14 +5,18 @@
 
 ## Features
 
+- Support multiple `--exec <cmd>` instances, see #406 and 
+#960 (@tmccombs)
 
 ## Bugfixes
 
 
 ## Changes
+
 - Changed `-u` flag to be equivalent to `-HI`. Multiple `-u` flags still allowed but do nothing, see #840 (@jacksontheel)
 
 ## Other
+
 - Added installation instructions for RHEL8, see #989 (@ethsol)
 
 # v8.3.2