update brew plugin from homebrew contributions

plugins/brew.plugin.zsh

@@ -1,6 +1,6 @@
 #compdef brew
 
-# copied from _fink
+# imported from the latest homebrew contributions
 
 _brew_all_formulae() {
   formulae=(`brew search`)
@@ -12,19 +12,25 @@ _brew_installed_formulae() {
 
 local -a _1st_arguments
 _1st_arguments=(
-  'install:install a formula'
-  'remove:remove a formula'
-  'search:search for a formula (/regex/ or string)'
-  'list:list files in a formula or not-installed formulae'
-  'link:link a formula'
-  'unlink:unlink a formula'
+  'cat:display formula file for a formula'
+  'cleanup:uninstall unused and old versions of packages'
+  'create:create a new formula'
+  'deps:list dependencies and dependants of a formula'
+  'doctor:audits your installation for common issues'
+  'edit:edit a formula'
   'home:visit the homepage of a formula or the brew project'
   'info:information about a formula'
-  'prune:remove dead links'
-  'update:freshen up links'
+  'install:install a formula'
+  'link:link a formula'
+  'list:list files in a formula or not-installed formulae'
   'log:git commit log for a formula'
-  'create:create a new formula'
-  'edit:edit a formula'
+  'outdated:list formulas for which a newer version is available'
+  'prune:remove dead links'
+  'remove:remove a formula'
+  'search:search for a formula (/regex/ or string)'
+  'unlink:unlink a formula'
+  'update:freshen up links'
+  'uses:show formulas which depend on a formula'
 )
 
 local expl
@@ -47,12 +53,12 @@ case "$words[1]" in
     _arguments \
       '(--unbrewed)--unbrewed[files in brew --prefix not controlled by brew]' \
       '1: :->forms' &&  return 0
-      
+
       if [[ "$state" == forms ]]; then
         _brew_installed_formulae
         _requested installed_formulae expl 'installed formulae' compadd -a installed_formulae
       fi ;;
-  install|home|log|info)
+  install|home|log|info|uses|cat|deps)
     _brew_all_formulae
     _wanted formulae expl 'all formulae' compadd -a formulae ;;
   remove|edit|xo)