Update InternalProcessStreamReader.cs

[xjfnet]

InternalProcessStreamReader encoding must be same as original StreamReader.
Process StandardOutput is Encoding.Default, but StreamReader is Encoding.Utf8 by default, it will leads to messy code when Command.StandardOutput.ReadLine() or Command.StandardOutput.ReadToEnd().

[madelson]

Hi @xjfnet thanks for contributing!

This looks like a very reasonable change. It looks like ProcessStartInfo already allows for the stdin/stdout encodings to be specified, so with this people can now leverage the API for customizing start info in order to work around any encoding problems, which is great. A few thoughts/questions:

• I'd like for the codebase to have a unit test that fails under the UTF8 case to explicitly demonstrate the problem and the correctness of the new code.
• We should also have a test case that demonstrates sending international characters across the wire to show that switching away from UTF8 doesn't break things.

For these test cases, I'm happy to have you add them yourself as part of this PR, or I can add them after merging. Let me know what you want to do!

[madelson]

This fix is part of 1.3.0 (https://www.nuget.org/packages/MedallionShell/1.3.0). Thanks again for submitting!