Add Composer's global binaries to PATH

plugins/composer/composer.plugin.zsh

@@ -46,3 +46,6 @@ alias cdu='composer dump-autoload'
 
 # install composer in the current directory
 alias cget='curl -s https://getcomposer.org/installer | php'
+
+# Add Composer's global binaries to PATH
+export PATH=$PATH:~/.composer/vendor/bin