Maria DB Support

[G470]

Please add Support for MariaDB. Currently the installation procedure throws syntax errors during create table process because the data type JSON is used. This can be replaced by LONGTEXT and should work as well :).

$table->json('validation'); $table->json('data'); $table->json('flags');
could be

$table->longtext('validation'); $table->longtext('data'); $table->longtext('flags');