Repository model enriched: Archived status available now

[nihirash]

We're using this library for making tech.map of our organisation - so we need filter out archived repositories.

To make it possible I did small changes - I've enriched repository model to support "archived" status.

If PR need some improvements - please write me - I'll do it.

[codecov]

Codecov Report

Merging #565 into master will decrease coverage by 13.83%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #565       +/-   ##
===========================================
- Coverage   91.46%   77.62%   -13.84%     
===========================================
  Files          24       24               
  Lines         656      657        +1     
  Branches        1        2        +1     
===========================================
- Hits          600      510       -90     
- Misses         56      147       +91     

Impacted Files	Coverage Δ
...4s/src/main/scala/github4s/domain/Repository.scala	100.00% <ø> (ø)
github4s/src/main/scala/github4s/Decoders.scala	84.55% <100.00%> (-7.30%)	⬇️
github4s/src/main/scala/github4s/Github.scala	0.00% <0.00%> (-100.00%)	⬇️
...ithub4s/src/main/scala/github4s/GithubConfig.scala	0.00% <0.00%> (-100.00%)	⬇️
...4s/src/main/scala/github4s/http/Http4sSyntax.scala	0.00% <0.00%> (-100.00%)	⬇️
...s/src/main/scala/github4s/domain/PullRequest.scala	0.00% <0.00%> (-100.00%)	⬇️
...s/src/main/scala/github4s/modules/GithubAPIs.scala	0.00% <0.00%> (-100.00%)	⬇️
.../src/main/scala/github4s/http/RequestBuilder.scala	0.00% <0.00%> (-100.00%)	⬇️
...ub4s/src/main/scala/github4s/http/HttpClient.scala	12.12% <0.00%> (-84.85%)	⬇️
.../scala/github4s/interpreters/AuthInterpreter.scala	60.00% <0.00%> (-40.00%)	⬇️
... and 2 more

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[BenFradet]

Thanks 👍