Merge pull request #1718 from toctan/master

command-not found support for Arch Linux

plugins/command-not-found/command-not-found.plugin.zsh

@@ -3,3 +3,7 @@
 # this is installed in Ubuntu
 
 [[ -e /etc/zsh_command_not_found ]] && source /etc/zsh_command_not_found
+
+# Arch Linux command-not-found support, you must have package pkgfile installed
+# https://wiki.archlinux.org/index.php/Pkgfile#.22Command_not_found.22_hook
+[[ -e /usr/share/doc/pkgfile/command-not-found.zsh ]] && source /usr/share/doc/pkgfile/command-not-found.zsh