scripts/buildstats-diff: make logger msg format a bit more readable

(From OE-Core rev: 49ae4382dd0a71f45989af3679bd35ce2bfa82f8)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/buildstats-diff

@@ -26,7 +26,7 @@ from datetime import datetime, timedelta, tzinfo
 from operator import attrgetter
 
 # Setup logging
-logging.basicConfig(level=logging.INFO)
+logging.basicConfig(level=logging.INFO, format="%(levelname)s: %(message)s")
 log = logging.getLogger()