Make "-Vim" another valid v:progname

References #147.

plugin/startify.vim

@@ -13,7 +13,7 @@ let g:loaded_startify = 1
 augroup startify
   if !get(g:, 'startify_disable_at_vimenter')
     autocmd VimEnter * nested
-          \   if !argc() && (line2byte('$') == -1) && (v:progname =~? '^[gmnq]\=vim\=x\=\%[\.exe]$')
+          \   if !argc() && (line2byte('$') == -1) && (v:progname =~? '^[-gmnq]\=vim\=x\=\%[\.exe]$')
           \ |   if get(g:, 'startify_session_autoload') && filereadable('Session.vim')
           \ |     source Session.vim
           \ |   else