add workers arg to CLI

fix test

try again

Author: Graeme22

tests/test_cli.py

@@ -54,8 +54,7 @@ def test_run_watch(mocker, cancel_remaining_task):
     assert 'files changed, reloading arq worker...' in result.output
 
 
-def test_multiple_workers(cancel_remaining_task, mocker, loop):
-    mocker.patch('asyncio.get_event_loop', lambda: loop)
+def test_multiple_workers():
     runner = CliRunner()
     result = runner.invoke(cli, ['tests.test_cli.WorkerSettings', '--workers', '4'])
     assert 'clients_connected=4' in result.output