v0.2.1

Changelog

• 34a663c Add comments update, so a posted comment can be corrected in place (#9)
• ca2a28d Stop the tap advertising a release nobody can download yet (#8)

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Verify a download:

shasum -a 256 -c trello-cli_0.2.1_checksums.txt --ignore-missing

Run trello-cli contract for the envelope version and exit-code table this
build obeys, and trello-cli version for the build itself.