add labels field to PullRequest

[KristofferC]

No description provided.

[KristofferC]

A question here @ararslan, @Keno, @jrevels.

What is the thought regarding things like a Vector of labels that exist here? Should there be a GitHub object called Label with the pertinent fields, and we then have a Vector{Label} or should we just do like this and keep it like a Dict?.

[Keno]

Either way is generally fine with me. I don't usually build out too much it in objects unless there's a good reason to.

[ararslan]

I'm fairly indifferent. Do whatever feels right in your heart.

[Keno]

See test failures. Other than that, this is fine.

[maleadt]

Rebased, and made this use the Label object that's since been introduced.

[codecov-commenter]

Codecov Report

Merging #115 (2efc8d6) into master (809994e) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #115   +/-   ##
=======================================
  Coverage   56.22%   56.22%           
=======================================
  Files          36       36           
  Lines         843      843           
=======================================
  Hits          474      474           
  Misses        369      369           

Impacted Files	Coverage Δ
src/GitHub.jl	100.00% <ø> (ø)
src/issues/issues.jl	32.14% <0.00%> (-27.86%)	⬇️
src/issues/labels.jl	100.00% <ø> (+81.25%)	⬆️
src/issues/pull_requests.jl	44.44% <ø> (ø)

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