Updating Python Snippet

Updated the property snippet for python to comply with new-style classes
Merge commit '5f1cbd9b73cc92fb852bc8609d71a811b059ac9b'
https://github.com/rodrigoaraujo01/snipmate.vim/commit/5f1cbd9b73cc92fb852bc8609d71a811b059ac9b

Author @rodrigoaraujo01

Conflicts:
	snippets/python.snippets