fix: user yarn default completion when possible

This will keep the completion up to date, and sharpen focus of this
tool: only add better completion, don't remove existing completion!

Fixes #7

yarn-completion.plugin.zsh

@@ -101,43 +101,9 @@ _yc_yarn_run_completion() {
   _describe 'values' options
 }
 
-_yc_yarn_commands_completion() {
-  _values \
-    'subcommand' \
-      'add[Installs a package and any packages that it depends on.]' \
-      'bin[Displays the location of the yarn bin folder.]' \
-      'cache[Yarn stores every package in a global cache in your user directory on the file system.]' \
-      'check[Verifies that versions of the package.]' \
-      'clean[Cleans and removes unnecessary files from package dependencies.]' \
-      'config[Manages the yarn configuration files.]' \
-      'generate-lock-entry[Generates a lock file entry.]' \
-      'global[Install packages globally on your operating system.]' \
-      'info[Show information about a package.]' \
-      'init[Interactively creates or updates a package.json file.]' \
-      'install[Install packages]' \
-      'licenses[List licenses for installed packages.]' \
-      'link[Symlink a package folder during development.]' \
-      'login[Store registry username and email.]' \
-      'logout[Clear registry username and email.]' \
-      'ls[List installed packages.]' \
-      'outdated[Checks for outdated package dependencies.]' \
-      'owner[Manage package owners.]' \
-      'pack[Creates a compressed gzip archive of package dependencies.]' \
-      'publish[Publishes a package to the npm registry.]' \
-      'remove[Remove package and update package.json and yarn.lock ]' \
-      'run[Runs a defined package script.]' \
-      'self-update[Updates Yarn to the latest version.]' \
-      'tag[Add, remove, or list tags on a package.]' \
-      'team[Maintain team memberships]' \
-      'unlink[Unlink a previously created symlink for a package.]' \
-      'upgrade[Upgrades packages to their latest version based on the specified range.]' \
-      'version[Updates the package version.]' \
-      'why[Show information about why a package is installed.]'
-}
-
 _yc_zsh_better_yarn_completion() {
   # Show yarn commands if not typed yet
-  [[ $(_yc_no_of_yarn_args) -le 2 ]] && _yc_yarn_commands_completion && return
+  [[ $(_yc_no_of_yarn_args) -le 2 ]] && _yarn "$@" && return
 
   # Load custom completion commands
   case "$(_yc_yarn_command)" in
@@ -150,6 +116,8 @@ _yc_zsh_better_yarn_completion() {
     run)
       _yc_yarn_run_completion
       ;;
+    *)
+      _yarn "$@"
   esac
 }