Update composer.plugin.zsh (ohmyzsh#5889)

Adds remove/global remove and optimize-autoloader commands.

plugins/composer/composer.plugin.zsh

@@ -39,11 +39,14 @@ alias c='composer'
 alias csu='composer self-update'
 alias cu='composer update'
 alias cr='composer require'
+alias crm='composer remove'
 alias ci='composer install'
 alias ccp='composer create-project'
 alias cdu='composer dump-autoload'
+alias cdo='composer dump-autoload --optimize-autoloader'
 alias cgu='composer global update'
 alias cgr='composer global require'
+alias cgrm='composer global remove'
 
 # install composer in the current directory
 alias cget='curl -s https://getcomposer.org/installer | php'