fix: fix search with scout database (monicahq/chandler#223)

Author: asbiin

database/migrations/2020_04_25_133132_create_contacts_table.php

@@ -37,6 +37,7 @@ public function up()
 
             if (config('scout.driver') === 'database' && in_array(DB::connection()->getDriverName(), ['mysql', 'pgsql'])) {
                 $table->fullText('first_name');
+                $table->fullText('last_name');
                 $table->fullText('middle_name');
                 $table->fullText('nickname');
                 $table->fullText('maiden_name');