scrabble-score: add parameters to exercise placeholder
scrabble-score: add parameters to exercise placeholder

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