roadmap: add bash to the list of new treesitter parsers

[jpoliv]

neovim 0.10.0-dev builds include the following new parsers:

• bash, markdown, python

Tree-sitter parsers in the 0.9 branch:

• https://github.com/neovim/neovim/blob/release-0.9/cmake.deps/cmake/BuildTreesitterParsers.cmake#L37-L39

versus tree-sitter parsers in the 0.10-dev branch:

• https://github.com/neovim/neovim/blob/master/cmake.deps/cmake/BuildTreesitterParsers.cmake#L37-L40

This can also be checked by downloading the binary linux tarballs and check the list of dynamic link libraries under the parser/ subdirectory. For example:

neovim 0.10.0-dev nightly:

$ curl -L https://github.com/neovim/neovim/releases/download/nightly/nvim-linux64.tar.gz
$ tar tf nvim-linux64.tar.gz  | grep parser | sort
nvim-linux64/lib/nvim/parser/
nvim-linux64/lib/nvim/parser/bash.so
nvim-linux64/lib/nvim/parser/c.so
nvim-linux64/lib/nvim/parser/lua.so
nvim-linux64/lib/nvim/parser/markdown_inline.so
nvim-linux64/lib/nvim/parser/markdown.so
nvim-linux64/lib/nvim/parser/python.so
nvim-linux64/lib/nvim/parser/query.so
nvim-linux64/lib/nvim/parser/vimdoc.so
nvim-linux64/lib/nvim/parser/vim.so

[clason]

It is a very well researched PR, though ;)

(In general, we don't track milestones that closely on the webpage in favor of :h news.)