fix: decode bytes not str (easy_xml.py)

[owl-from-hogvarts]

See nodejs/node-gyp/issues/2505

proper fix for #118
Special thanks to @cclauss

[cclauss]

Please rebase so we can ensure that the tests pass.

[owl-from-hogvarts]

Please rebase so we can ensure that the tests pass.

Done

[legendecas]

This seems incorrect to me. XmlToString always returns a str and a str object has no attribute decode.

[cclauss]

Correct: str.encode() and bytes.decode() exist but the opposites are undefined.

>>> for s_or_b in ("s", b"b"):
...     for method_name in ("encode", "decode"):
...         print(f"{s_or_b}: {method_name} is {getattr(s_or_b, method_name, None)}")
...
s: encode is <built-in method encode of str object at 0x103cbe928>
s: decode is None
b'b': encode is None
b'b': decode is <built-in method decode of bytes object at 0x103cb4bf0>