Fix class name for OBJECT command.

Starting with PHP 7.2 "object" is a reserved word and cannot be used as
a name for classes, interfaces or traits.

src/Command/Redis/OBJECT_.php

@@ -18,7 +18,7 @@ use Predis\Command\Command as RedisCommand;
  *
  * @author Daniele Alessandri <suppakilla@gmail.com>
  */
-class OBJECT extends RedisCommand
+class OBJECT_ extends RedisCommand
 {
     /**
      * {@inheritdoc}

src/Command/RedisFactory.php

@@ -26,6 +26,7 @@ class RedisFactory extends Factory
         $this->commands = array(
             'ECHO' => 'Predis\Command\Redis\ECHO_',
             'EVAL' => 'Predis\Command\Redis\EVAL_',
+            'OBJECT' => 'Predis\Command\Redis\OBJECT_',
         );
     }
 

tests/Predis/Command/Redis/OBJECT_Test.php

@@ -22,7 +22,7 @@ class OBJECT_Test extends PredisCommandTestCase
      */
     protected function getExpectedCommand()
     {
-        return 'Predis\Command\Redis\OBJECT';
+        return 'Predis\Command\Redis\OBJECT_';
     }
 
     /**

tests/Predis/Command/RedisFactoryTest.php

@@ -27,7 +27,7 @@ class RedisFactoryTest extends PredisTestCase
         $factory = new RedisFactory();
 
         foreach ($this->getExpectedCommands() as $commandID) {
-            $this->assertTrue($factory->supportsCommand($commandID));
+            $this->assertTrue($factory->supportsCommand($commandID), "Command factory does not support $commandID");
         }
     }