updating doctl to 1.5.0

[bryanl]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same formula update/change?
• Have you built your formula locally prior to submission with brew install <formula> (where <formula> is the name of the formula you're submitting)?
• Does your submission pass brew audit --new-formula <formula> (after doing brew install <formula>)?

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[bryanl]

Is this a merge conflict? I don't see it on my side.

[MikeMcQuaid]

Yes. Rebase commits by running brew update; git checkout $YOUR_BRANCH; git rebase origin/master and then fix all merge conflicts then git push --force-with-lease. Thanks!

[ilovezfs]

@BrewTestBot test this please

[ilovezfs]

@bryanl thanks for your contribution to Homebrew and taking the time to resolve the conflict!