Add probot/stale config
Add probot/stale config

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