Merge pull request #15 from Algatux/late_notation

Referencing class with ::class does not work with PHP 5.4

src/Connection.php

@@ -248,7 +248,7 @@ public function canTryAgain($attempt, $ignoreTransactionLevel = false)
     private function resetTransactionNestingLevel()
     {
         if(!$this->selfReflectionNestingLevelProperty instanceof \ReflectionProperty) {
-            $reflection = new \ReflectionClass(parent::class);
+            $reflection = new \ReflectionClass('Doctrine\DBAL\Connection');
             $this->selfReflectionNestingLevelProperty = $reflection->getProperty("_transactionNestingLevel");
             $this->selfReflectionNestingLevelProperty->setAccessible(true);
         }