fix spacing around keyword assignment

runtests.py

@@ -50,7 +50,7 @@ def test_synciter2(self):
         onlyleft = []
         keyequal = []
         # key is the first element
-        for a, b in mrepo.synciter(left, right, key = lambda x: x[0]):
+        for a, b in mrepo.synciter(left, right, key=lambda x: x[0]):
             if a is None:
                 onlyright.append(b)
             elif b is None: