Add topics to pangram exercise in config.json
Add topics to pangram exercise in config.json

addresses #353
exercism/python,exercism/xpython,mweb/python,smalley/python,jmluy/xpython,smalley/python,N-Parsons/exercism-python,pheanex/xpython,jmluy/xpython,N-Parsons/exercism-python,behrtam/xpython,exercism/xpython,behrtam/xpython,exercism/python,rootulp/xpython,pheanex/xpython,mweb/python,rootulp/xpython