GH-86: Notification in channel on MR reopen

[ashishbhate]

Send notification in channel on MR reopen. Fixes #86

I had to update my go.mod file to get the plugin to work. I'm not sure if the CI needs it.

See messages starting from https://community.mattermost.com/core/pl/nj3bdn8b8ifjfp9r8w41frk84w

[ashishbhate]

CI is failing with the same error I was seeing with the dependency versions in the go.mod file. There's a link in the OP to the community server chat log where I've posted how I fixed this error.

[levb]

The build is failing because of go.mod and go 1.13, fix should be coming to master shortly.

[cpoile]

Nice work @ashishbhate -- just a suggestion to clean up the code a bit.

[jfrerich]

LGTM, pending change request from @cpoile! Thanks, @ashishbhate!

[ashishbhate]

Updated with switch instead of long if-else. Let me know if you need me to squash the two commits into a single commit.

[levb]

@ashishbhate can you please sync and merge with master to fix the build?

[ashishbhate]

@levb I've merged master into the branch

[mattermod]

This issue has been automatically labelled "stale" because it hasn't had recent activity.
A core team member will check in on the status of the PR to help with questions.
Thank you for your contribution!

/cc @jasonblais @hanzei

[jasonblais]

@DHaussermann Friendly reminder to help with QA review :)

[DHaussermann]

@levb this PR is still untested as I unable to build this. Let's follow-up so I can get assistance from someone on the team to see what's going on.

[ashishbhate]

Hi guys, let me know if there's anything I can do to help get this PR merged.

[DHaussermann]

Tested and passed
Created a webhook and confirmed that re-opening a merge request delivers an event as expected
LGTM!
Thanks @ashishbhate for fixing this issue. Apologies for the delay on this one.