Merge pull request #606 from slebedev/issues/605

added small snippet for use python3 interpreter

snippets/python.snippets

@@ -1,6 +1,9 @@
 snippet #!
 	#!/usr/bin/env python
 	# -*- coding: utf-8 -*-
+snippet #!3
+	#!/usr/bin/env python3
+	# -*- coding: utf-8 -*-
 snippet imp
 	import ${0:module}
 snippet uni