Allows to set custom properties on a teams client (#927)

Co-authored-by: Niko Köser <[email protected]>

feat(service): PagerDuty service integration (#933)

Co-authored-by: Niko Köser <[email protected]>

Sendgrid: Allow to specify the content type (#871)

Co-authored-by: Niko Köser <[email protected]>

refactor(msteams): fix depreated parts in msteams service (#853)

chore(deps): update and tidy Go dependencies (#875)

fix(notify)!: resolve test & linter issues and fix dependencies compa…

…tibility (#847)

fix(deps): update all dependencies

feat(service): Adds Mattermost service (#516)

* feat(service): Adds Mattermost service

* refactor: Removes log msgs
fix: Adds PreSend and PostSend capabilities to user
docs: Updates doc.go and README.md

* refactor: Adds test cases
Adds presend and postsend tests for mattermost service

* refactor: Updates mattermost test cases

* refactor: update mattermost test cases

* refactor: update mattermost hook(s) test cases

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Co-authored-by: EthanEFung <[email protected]>
Co-authored-by: Niko Köser <[email protected]>

Add telegram.SetClient function (#602)

Co-authored-by: Niko Köser <[email protected]>