Map Q to "quit" netrw

Map Q to "quit" netrw by pressing <C-6>

Ex mode is nice, but I don't feel like I'm going to need it in a file
browser ever (since I won't really be editing the file)

plugin/vinegar.vim

@@ -89,6 +89,7 @@ function! s:setup_vinegar() abort
   xmap <buffer> ! .!
   nnoremap <buffer> <silent> cg :exe 'keepjumps cd ' .<SID>fnameescape(b:netrw_curdir)<CR>
   nnoremap <buffer> <silent> cl :exe 'keepjumps lcd '.<SID>fnameescape(b:netrw_curdir)<CR>
+  nnoremap <buffer> Q <C-6>
   exe 'syn match netrwSuffixes =\%(\S\+ \)*\S\+\%('.join(map(split(&suffixes, ','), s:escape), '\|') . '\)[*@]\=\S\@!='
   hi def link netrwSuffixes SpecialKey
 endfunction