Log Message:
shoutrrr: Update to 0.8.0

Changes:
0.8.0
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* feat(generic): extra data and custom headers
* fix(bark): fix param icon
* fix(ifttt): treat all 2xx http responses as success
* Update matrix docs to mention `title` caveat
* feat(telegram): add support for message_thread_id
* docs(generic): add home assistant example
* docs(zulip): make Zulip documentation examples more consistent