Updated meetup tests to prevent creating a `datetime.date` with `month=13`
Updated meetup tests to prevent creating a `datetime.date` with `month=13`

A common mistake I have seen is to calculate the last day of a month as:

    >>> date(year, month + 1, 1) - timedelta(days=1)

Which will raise a `ValueError` when `month` is `12` (December). This test
will prevent students from making this wrong assumption.

smalley/python,pheanex/xpython,smalley/python,jmluy/xpython,exercism/xpython,behrtam/xpython,wobh/xpython,mweb/python,Peque/xpython,de2Zotjes/xpython,exercism/xpython,ZacharyRSmith/xpython,N-Parsons/exercism-python,Peque/xpython,mweb/python,jmluy/xpython,outkaj/xpython,rootulp/xpython,pombredanne/xpython,orozcoadrian/xpython,de2Zotjes/xpython,ZacharyRSmith/xpython,oalbe/xpython,wobh/xpython,pheanex/xpython,exercism/python,rootulp/xpython,oalbe/xpython,outkaj/xpython,N-Parsons/exercism-python,pombredanne/xpython,behrtam/xpython,exercism/python,orozcoadrian/xpython