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add kusionstack to Users
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Add curio to users.md
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Because we are using it :D
[Mercure](https://mercure.rocks), an open solution for real-time
communications designed to be fast, reliable and battery-efficient is a
proud user of GoReleaser.
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This will add Goldenhand Software to users' list
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I would like to support GoReleaser as a solo contactor
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https://www.goldenhandsoftware.co.uk/
Note: I love the announce functionality of GoReleaser and I do think
anything other than Slack should be included in GoReleaser PRO. Announce
requires a good time of development for change notes to be announced in
different integrations. As a developer who do integrations every day, I
do think announce section should require PRO (excluding slack and
webhook one)
