fix test in binary mode windows, and OS would overwrite the line sepa…

…rator

tests/test_io.py

@@ -250,7 +250,7 @@ def test_warnings(self, extension):
                 if extension == ".txt":
                     assert f.readline() == content
                 else:
-                    assert f.readline().decode("utf-8") == content
+                    assert f.readline().decode("utf-8").rstrip() == content.rstrip()
 
             # Implicit `mode` warning
             with (