etl: Add parameter to exercise placeholder to fix #556
etl: Add parameter to exercise placeholder to fix #556


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