Add htsget 1.2.0, OpenAPI v3.0.2 spec#385

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brainstorm wants to merge 10 commits intosamtools:masterfrom umccr:htsget-openapi

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Commits on May 17, 2019

Commits on Jun 26, 2019

Bump to 1.2.0 htsget spec, flesh out error messages and other feedback from @mlin (thanks), also add class as an extra attribute. /cc @ohofmann
brainstorm
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Commits on Sep 2, 2019

Variants example should contain VCF, not BAM
brainstorm
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Commits on Sep 16, 2019

Substitute URL to non-specific one, thanks @jmarshall
brainstorm
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