Added another python sample for detection via hashbang line

Created a sample file that includes the env of 'python2', which had caused the python file at https://github.com/mstill/thunner/blob/c3ede9b791a23266c8a19387868a1650161a6833/thunner to be incorrectly detected, causing an unmatched single quote that was in fact an apostrophe in a comment (see line 219 and below). Also see issue https://github.com/github/linguist/issues/264 as it is related (though I don't think this will fix that specific issue).