chore: bumps version to 0.5.1 [FC-0049]

[pomegranited]

Need to bump the version in order to trigger a new release.

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[pomegranited]

@ormsbee @bradenmacdonald Sorry to bug you, but could I get a 👍 on this version bump? I merged #145 but didn't notice that we already had a v5.0.0 tag.

Edit oh! looks like i can merge this after all. Sorry for the noise!

[openedx-webhooks]

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