README: replace Travis CI png badge with svg
README: replace Travis CI png badge with svg
exercism/xpython,N-Parsons/exercism-python,exercism/python,rootulp/xpython,exercism/python,mweb/python,smalley/python,behrtam/xpython,N-Parsons/exercism-python,pheanex/xpython,behrtam/xpython,exercism/xpython,pheanex/xpython,jmluy/xpython,smalley/python,mweb/python,jmluy/xpython,rootulp/xpython