Strikethrough in Pluto Markdown block

[icweaver]

Update: Just saw Michael’s awesome announcement: [ANN] CommonMark.jl - #19 by mike

using CommonMark

p() = enable!(Parser(), StrikethroughRule())

cm"""
## TODO:

1. One
1. <s>Two</s> `# or <del></del>`
1. ~~Three~~
"""p

The future is now.