fix: Add GitHub PullRequest Labels

[wlynch]

Adds labels to PullRequest for the GitHub driver for #21

Does not include an integration test, since no PR in the example repo or the drone/go-scm repo have a sample labelled PR (AFAICT anyway).

[rawlingsj]

@wlynch we're just switching our build infra ATM so CI is temporarily disabled, hope to have everything back working tomorrow!

[jstrachan]

/test all

[jstrachan]

/lgtm

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[jstrachan]

/override Semantic Pull Request

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@jstrachan: Overrode contexts on behalf of jstrachan: Semantic Pull Request

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/override Semantic Pull Request

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