Revert "Remove preferred-install from composer.json"
Revert "Remove preferred-install from composer.json"

This reverts commit 3fdcb1f6771fb248d0736673ba0a6b3b6e923cc5.

zoophp/pushwoosh,schimpanz/Laravel-Pushwoosh,hoymultimedia/Laravel-Pushwoosh,zoophp/pubnub