Remove deprecated hook from composer.json
Remove deprecated hook from composer.json

`composer install` outputs the following message:

The CakePHP plugin installer v1.3+ no longer requires
the "post-autoload-dump" hook. Please update your app's
composer.json file and remove usage of
Cake\Composer\Installer\PluginInstaller::postAutoloadDump

Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2