Change underscore to hyphen for check-exercises.py
Change underscore to hyphen for check-exercises.py

The script uses a hyphen instead of an underscore

de2Zotjes/xpython,behrtam/xpython,smalley/python,mweb/python,exercism/python,rootulp/xpython,oalbe/xpython,pheanex/xpython,oalbe/xpython,pheanex/xpython,jmluy/xpython,exercism/xpython,mweb/python,N-Parsons/exercism-python,N-Parsons/exercism-python,exercism/python,de2Zotjes/xpython,jmluy/xpython,exercism/xpython,behrtam/xpython,smalley/python,rootulp/xpython