added names for the assertEqual snippet, as it was hard to see what was going on

UltiSnips/python.snippets

@@ -30,7 +30,7 @@ def ${1:function name}(${2:parameters}):
 endsnippet
 
 snippet ae "Assert equals"
-self.assertEqual($1, $2)
+self.assertEqual(${1:var}, ${2:var})
 endsnippet
 
 snippet at "Assert true"