Treesitter

[mhanberg]

I'm not really sure what sort of Elixir specific treesitter integrations we can include, but we'll use this issue to collect them and track them.

• Library specific highlights (Phoenix keywords for example).
• Track this PR in nvim-treesitter Embedded templates: ERB, EEX nvim-treesitter/nvim-treesitter#1352

[connorlay]

Additional highlight queries that don't really belong in the main nvim-treesitter repository would be a good addition. For example, highlighting certain Phoenix macros as keywords.