add a Whitespace hl group for neovim

colors/paramount.vim

@@ -167,6 +167,7 @@ call s:h("DiffDelete",    {"fg": s:red})
 call s:h("DiffChange",    {"fg": s:dark_yellow})
 call s:h("DiffText",      {"fg": s:dark_blue})
 call s:h("SignColumn",    {"fg": s:light_green})
+call s:h("Whitespace",    {"fg": s:light_green})
 
 
 if has("gui_running")