Updated nuspec to include python code files

[Tom-Kingstone]

NOTE: Depends on

Issues addressed by this PR

Closes #197

Test files

Changelog

Additional comments

[Tom-Kingstone]

@BHoMBot check core
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[bhombot-ci]

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[Tom-Kingstone]

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[bhombot-ci]

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[Tom-Kingstone]

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[FraserGreenroyd]

It's a shame it has to be so hard coded, but this fixes the immediate issue

[FraserGreenroyd]

@BHoMBot check installer
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[bhombot-ci]

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