Services API "Slack notifications"

[ivan-masich]

Can you please implement "Slack notifications" service management.
https://docs.gitlab.com/ee/api/services.html#slack-notifications

[gmessner]

@mind-blowing
I've made the initial commit of the mods to support Slack Notifications. I still need to add unit tests before doing an official release, should happen in the next day or two.

[gmessner]

@mind-blowing
GitLab4J Release 4.8.14 has been released with support for configuring/managing the Slack notifications service.

[ivan-masich]

Thanks a lot, it works.