util/release: Improve reporting of required tools

genrelnotes checks for cloc, git and rename but only reported about
needing the first two, so mention `rename` in missing message.

Change-Id: If91d759fc68760fd89b98756ac5b19ac3589c197
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41338
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/release/genrelnotes

@@ -16,7 +16,7 @@
 
 if ! ( git --version && cloc --version && rename --version ) > /dev/null 2>&1
 then
-	echo "ERROR: cloc or git is not installed.  Exiting"
+	echo "ERROR: cloc, git or rename is not installed.  Exiting"
 	exit 1
 fi