Update Token.php

[MarwanSalim]

I want to suggest the followings:

The foreign_data datatype should be an array because of this:

    /**
     * @param \Cake\Database\Schema\TableSchema $schema Schema
     * @return \Cake\Database\Schema\TableSchema
     */
    protected function _initializeSchema(TableSchema $schema)
    {
        $schema->setColumnType('foreign_data', 'json');

        return $schema;
    }

Code reference: https://github.com/UseMuffin/Tokenize/blob/master/src/Model/Table/TokensTable.php#L118

Further readings:

The code above maps the preferences column to the json custom type. This means that when retrieving data for that column, it will be unserialized from a JSON string in the database and put into an entity as an array.

Reference: https://book.cakephp.org/3/en/orm/saving-data.html#saving-complex-types

Thank you