clock: Add parameters to exercise placeholder to fix #551
clock: Add parameters to exercise placeholder to fix #551


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