Replaced deprecated assertEquals

tests/signing/tests.py

@@ -109,7 +109,7 @@ class TestSigner(TestCase):
         binary_key = b'\xe7'  # Set some binary (non-ASCII key)
 
         s = signing.Signer(binary_key)
-        self.assertEquals('foo:6NB0fssLW5RQvZ3Y-MTerq2rX7w', s.sign('foo'))
+        self.assertEqual('foo:6NB0fssLW5RQvZ3Y-MTerq2rX7w', s.sign('foo'))
 
 
 class TestTimestampSigner(TestCase):