Merge branch 'master' into 'master'

Master

See merge request !12
2 jobs for master in 6 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #479
test

00:00:06

 
  Build
skipped #480
build
 
Name Stage Failure
failed
test Test
From https://gitlab.ucc.asn.au/UCC/discord-bot
53c4f46..9a1cbcb master -> origin/master
Checking out 9a1cbcb1 as master...
Skipping Git submodules setup
Checking cache for default...
time="2020-05-01T15:54:31+08:00" level=error msg="Docker executor: prebuilt image helpers will be loaded from /var/lib/gitlab-runner."
Successfully extracted cache
$ rustc --version
bash: line 80: rustc: command not found
ERROR: Job failed: exit status 1