Create tests for Workflows endpoint

[allardbrain]

This endpoint in the ClubhouseClient class in api.py needs to have a test created:

• list_workflows()

When tests should fail

• The request URL did not match the URL for the endpoint
• The HTTP method in the request did not match what is required by the endpoint
• Required argument(s) was(were) not provided
• Argument(s) was(were) not of the right type
• An integer supplied as an argument is smaller than 1

When tests should succeed

• The request URL matched the URL for the endpoint
• The HTTP method in the request matched what is required by the endpoint
• The required argument(s) was(were) provided
• Argument(s) was/(were) of the correct type
• An integer supplied as an argument is equal to or greater than 1