Add vim-treesitter-context support

[pevhall]

Request support for nvim-treesitter-context.

current work around highlight TreesitterContext guibg=black

[marko-cerovac]

Done. the background is darker now

[pevhall]

Only the background for the line numbers seems to be changing for me (see pick below). It's definitely an improvement but I think making the whole line stand out would be better.

[marko-cerovac]

@pevhall I've fixed the highlighting . It should be working perfectly now. Sorry for the wait and let me know if there is anything else to fix.

[pevhall]

Thanks @marko-cerovac it works perfectly now