tests/unit/exception_test.py: fixed style warning.

Author: steenzout

tests/unit/exception_test.py

@@ -100,4 +100,5 @@ def test(self):
         expected = ''
         error = SuppliedTokenNotAcceptedError()
 
-        self.assertFarmerError(error, SuppliedTokenNotAcceptedError.CODE, expected)
+        self.assertFarmerError(
+            error, SuppliedTokenNotAcceptedError.CODE, expected)