bumped Symfony version to 3.4.0

Author: fabpot

src/Symfony/Component/HttpKernel/Kernel.php

@@ -65,12 +65,12 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
     private $projectDir;
     private $warmupDir;
 
-    const VERSION = '3.4.0-BETA1';
+    const VERSION = '3.4.0-DEV';
     const VERSION_ID = 30400;
     const MAJOR_VERSION = 3;
     const MINOR_VERSION = 4;
     const RELEASE_VERSION = 0;
-    const EXTRA_VERSION = 'BETA1';
+    const EXTRA_VERSION = 'DEV';
 
     const END_OF_MAINTENANCE = '11/2020';
     const END_OF_LIFE = '11/2021';