update support for i3config.vim

This resolves #167.

Thanks to Thiago Perrotta <tbperrotta@gmail.com> (@thiagowfx).

Author: ap

after/syntax/i3.vim

@@ -1,3 +1,4 @@
+" see also: i3config.vim for the stock Vim 8.2+ syntax
 " Colour => https://github.com/moon-musick/vim-i3-config-syntax
 " i3*    => https://github.com/PotatoesMaster/i3-vim-syntax
 call css_color#init('hex', 'none', 'Colour,i3SimpleString,i3Color1st,i3Color2nd,i3ColorLast')

after/syntax/i3config.vim

@@ -1,2 +1,3 @@
-" https://github.com/mboughaba/i3config.vim
-call css_color#init('hex', 'none', 'Color')
+" i3ConfigColor => stock Vim syntax and recent https://github.com/mboughaba/i3config.vim
+" Color         => https://github.com/mboughaba/i3config.vim prior to dff3b177ebaf6aae35591cd4c9c734fff9ed7145
+call css_color#init('hex', 'none', 'i3ConfigColor,Color')