Remove default value from --workers in click

Fixes GH-2624

Author: mattrobenolt

src/sentry/runner/commands/start.py

@@ -18,7 +18,7 @@
 
 @click.command()
 @click.option('--bind', '-b', default=None, help='Bind address.', metavar='ADDRESS')
-@click.option('--workers', '-w', default=3, show_default=True, help='The number of worker processes for handling requests.')
+@click.option('--workers', '-w', help='The number of worker processes for handling requests.')
 @click.option('--upgrade', default=False, is_flag=True, help='Upgrade before starting.')
 @click.option('--noinput', default=False, is_flag=True, help='Do not prompt the user for input of any kind.')
 @click.argument('service', default='http', type=click.Choice(sorted(SERVICES.keys())))