feat(md): Strike through and task lists (#857)
feat(md): Strike through and task lists (#857)

Fixes #345

Co-authored-by: Ed Page <3088b3a91c8d64efae58d04f5cf95202c570a00e@duosecurity.com>
cobalt-org/cobalt.rs,cobalt-org/cobalt.rs,cobalt-org/cobalt.rs,cobalt-org/cobalt.rs