Merge branch 'patch-1' into 'master'

Add underline and strikethrough support.

See merge request !5
7 jobs for master in 44 seconds (queued for 1 second)
Name Stage Failure
failed
build Build
Checking out 019c1acf as master...
Skipping Git submodules setup
$ # Auto DevOps variables and functions # collapsed multi-line command
$ setup_docker
$ build
Logging to GitLab Container Registry with CI credentials...
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Get https://registry-1.docker.io/v2/: unauthorized: incorrect username or password
ERROR: Job failed: exit code 1