vim-notify support

[Miradorn]

Is your feature request related to a problem? Please describe.
Hey there and thanks for the great theme!
Maybe it would be possible to add support for https://github.com/rcarriga/nvim-notify ?
See this related issue shaunsingh/nord.nvim#58 for the highlight groups.
(If i'll find time i'll put up a PR myself soon, promised 8) )

Describe the solution you'd like
Add vim-notify highlight groups

Describe alternatives you've considered
Adding the highlight in my personal config. Since vim-notify seems to be used by many folks i guess it would be nice to add it to the theme itself.

Additional context