Fix min requirements

composer.json

@@ -17,7 +17,7 @@
         "psr/log": "~1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0",
+        "phpunit/phpunit": "~4.5",
         "graylog2/gelf-php": "~1.0",
         "raven/raven": "~0.5",
         "ruflin/elastica": ">=0.90 <3.0",

src/Monolog/Handler/GelfHandler.php

@@ -13,6 +13,7 @@ namespace Monolog\Handler;
 
 use Gelf\IMessagePublisher;
 use Gelf\PublisherInterface;
+use Gelf\Publisher;
 use InvalidArgumentException;
 use Monolog\Logger;
 use Monolog\Formatter\GelfMessageFormatter;
@@ -31,16 +32,16 @@ class GelfHandler extends AbstractProcessingHandler
     protected $publisher;
 
     /**
-     * @param PublisherInterface|IMessagePublisher $publisher a publisher object
-     * @param integer                              $level     The minimum logging level at which this handler will be triggered
-     * @param boolean                              $bubble    Whether the messages that are handled can bubble up the stack or not
+     * @param PublisherInterface|IMessagePublisher|Publisher $publisher a publisher object
+     * @param integer                                        $level     The minimum logging level at which this handler will be triggered
+     * @param boolean                                        $bubble    Whether the messages that are handled can bubble up the stack or not
      */
     public function __construct($publisher, $level = Logger::DEBUG, $bubble = true)
     {
         parent::__construct($level, $bubble);
 
-        if (!$publisher instanceof IMessagePublisher && !$publisher instanceof PublisherInterface) {
-            throw new InvalidArgumentException("Invalid publisher, expected a Gelf\IMessagePublisher or Gelf\PublisherInterface instance");
+        if (!$publisher instanceof Publisher && !$publisher instanceof IMessagePublisher && !$publisher instanceof PublisherInterface) {
+            throw new InvalidArgumentException("Invalid publisher, expected a Gelf\Publisher, Gelf\IMessagePublisher or Gelf\PublisherInterface instance");
         }
 
         $this->publisher = $publisher;