Update ROADMAP.md
Update ROADMAP.md

Cooperating with this PR: https://github.com/VSCodeVim/Vim/pull/1712
Chillee/Vim,VSCodeVim/Vim,westim/Vim,VSCodeVim/Vim,westim/Vim,Chillee/VSCodeNeovim,Chillee/VSCodeNeovim,westim/Vim,Chillee/VSCodeNeovim,Chillee/Vim