Add italics in vim

Italicizes comments and anything which should be italicized in text
(e.g. markdown *star-surrounded* words). Might lead to errors in ssh
connections, will have to test.

.config/nvim/init.vim

@@ -283,6 +283,8 @@ let g:ale_linters = {
 " PLUGIN: TMUXLINE
 let g:airline_powerline_fonts=1
 let g:airline_theme='raven'
+
+let g:gruvbox_italic=1
 colorscheme gruvbox
 
 " disable automatically refreshing the mux statusbar since it breaks tmux