Merge branch 'slackbot' into 'v2.3'

Send slack messages on /newLink

See merge request !139
2 jobs for v2.3 in 2 minutes and 2 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #10249
Go-py3.7

00:01:03

 
  Lint
passed #10250
Go-flake8

00:00:58