public function down()
{
Schema::table('invitations', function ($table) {
$table->dropColumn('signature_base64');
$table->dropColumn('signature_date');
});
Schema::table('companies', function ($table) {
$table->dropColumn('utm_source');
$table->dropColumn('utm_medium');
$table->dropColumn('utm_campaign');
$table->dropColumn('utm_term');
$table->dropColumn('utm_content');
});
}