expose __version__ in trio_websocket module

[belm0]

and hide version module

[coveralls]

Pull Request Test Coverage Report for Build 76

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.492%

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Totals
Change from base Build 75:	0.0%
Covered Lines:	466
Relevant Lines:	488

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💛 - Coveralls

[belm0]

@mehaase please consider a release after this

[mehaase]

Thanks for the PR. Just released 0.8.0.