Added Laravel 6.0 support.

Requirements:

Now requires Laravel 5.8 and newer, and PHP 7.2 and newer. (Drops L5.7 and older)

Older Laravel versions can use prior versions of this package:
v2: L5.4-5.8 (PHP 7.0-7.3)
v1: L5.1-5.8 (PHP 5.6-7.3)

Upgrading

Upgrading from v2

Upgrading from v2 to v3 is simple: just update ^2.xxx to ^3.0 in your composer.json and run composer update
There are no migration-related changes for moving from v2 to v3.

Upgrading from v1

The upgrade from v1 is complex because the db schema was changed significantly. See the documentation for a gist which may help with migrating database data. An upgrade from v1 should be planned with care and plenty of time allocated to it.