tpope/vim-markdown — pull request #43 by EDmitry (2013-05-28 02:56:11+00:00)
Title: Add support for ~~~ code fencing

I would appreciate if you consider adding the support for using tildes for code fencing. They make markdown a little bit more readable.
In the proposed patch I also allow once space between `~~~` and the language name for better readability as well.

Thanks.