Get archive should use RawAPIResponse

[yahavi]

The response of /api/1.0/projects/{projectKey}/repos/{repositorySlug}/archive is a raw zip, tar, or tgz. Therefore trying to decode it to APIResponse may fail:

// The following line returns an error:
err := json.NewDecoder(r.Body).Decode(&response.Values)

I got the following error when trying to download a tar.gz file:

invalid character '\x1f' looking for beginning of value

The solution that resolved the issue for me is to use RawAPIResponse.

[codecov]

Codecov Report

Merging #64 (be1a0d5) into master (7d616f7) will increase coverage by 1.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   58.52%   59.53%   +1.00%     
==========================================
  Files           5        5              
  Lines        7747     8021     +274     
==========================================
+ Hits         4534     4775     +241     
- Misses       2211     2242      +31     
- Partials     1002     1004       +2     

Impacted Files	Coverage Δ
default_api.go	60.43% <0.00%> (+1.10%)	⬆️
configuration.go	50.00% <0.00%> (-7.15%)	⬇️
webhook.go	0.00% <0.00%> (ø)
api_response.go	43.85% <0.00%> (+0.18%)	⬆️
api_client.go	38.42% <0.00%> (+2.46%)	⬆️

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[gfleury]

Hey thanks for contributing! LGTM