prime-factors: Update test cases (#451)
prime-factors: Update test cases (#451)

Updates the test cases according to the canonical test data
and stores the test data version.
jmluy/xpython,mweb/python,N-Parsons/exercism-python,jmluy/xpython,smalley/python,smalley/python,exercism/xpython,exercism/xpython,pheanex/xpython,behrtam/xpython,N-Parsons/exercism-python,exercism/python,behrtam/xpython,exercism/python,mweb/python,pheanex/xpython