poker: Add parameters to exercise placeholder
poker: Add parameters to exercise placeholder

exercism/python,pheanex/xpython,behrtam/xpython,exercism/xpython,smalley/python,behrtam/xpython,mweb/python,pheanex/xpython,N-Parsons/exercism-python,exercism/xpython,exercism/python,smalley/python,mweb/python,jmluy/xpython,jmluy/xpython,N-Parsons/exercism-python