Ignore some more vim artifacts

.gitignore

@@ -21,6 +21,8 @@ mutt/smime/
 ssh/*
 !ssh/config
 
+# This is installed by the setup script.
+vim/autoload/plug.vim
 vim/.viminfo*
 vim/vim_shared_data
 vim/.nviminfo
@@ -28,6 +30,8 @@ vim/view/
 vim/spelling*
 vim/init.vim
 vim/backup/
+# vim-plug plugin directory
+vim/plugged/
 
 zsh/cache/