Set User-Agent for API requests to DNSimple (#5927)
* Set the user-agent for API requests to DNSimple
* Update user agent format
* Add changelog fragment
* Update changelogs/fragments/5927-set-user-agent-dnsimple.yml
Co-authored-by: Felix Fontein <felix@fontein.de>
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Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 33df7b61c0)
Co-authored-by: Ivan Bakalov <ibbakalov@gmail.com>