Fix Version equality

[albertvillanova]

I think Version equality should align with other similar cases in Python, like:

In [1]: "a" == 5, "a" == None
Out[1]: (False, False)

In [2]: "a" != 5, "a" != None
Out[2]: (True, True)

With this PR, we will get:

In [3]: Version("1.0.0") == 5, Version("1.0.0") == None
Out[3]: (False, False)

In [4]: Version("1.0.0") != 5, Version("1.0.0") != None
Out[4]: (True, True)

Note I found this issue when doc-builder tried to compare:

if param.default != inspect._empty

where param.default is an instance of Version.

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[lhoestq]

Thanks, sounds good :)