fix pep8

Author: charlesdong1991

pandas/tests/reshape/merge/test_merge.py

@@ -1535,5 +1535,6 @@ def test_merge_suffix_errors(suffixes):
     a = pd.DataFrame({0: [1, 2, 3]})
     b = pd.DataFrame({0: [4, 5, 6]})
 
-    with pytest.raises(ValueError, match="columns overlap but no suffix specified"):
+    with pytest.raises(ValueError,
+                       match="columns overlap but no suffix specified"):
         a.merge(b, left_index=True, right_index=True, suffixes=suffixes)