Better usage help for the coverage_changes management command.

 - Legacy-Id: 11193

Author: levkowetz

ietf/utils/management/commands/coverage_changes.py

@@ -12,6 +12,7 @@
 
 class Command(BaseCommand):
     help = "Compare coverage between the latest release and the latest test run."
+    args = "[master_json latest_json]"
     option_list = BaseCommand.option_list + (
         make_option('--sections', default='template,url,code', dest='sections',
             help='Specify which kinds of coverage changes to show. Default: %default'),