prepared the 2.0.3 release

doc/changelog.rst

 Changelog
 =========
 
-2.0.3 (2016-XX-XX)
+2.0.3 (2016-08-22)
 ------------------
 
 * fixed lazy evaluation of 'monolog.use_error_handler'

src/Silex/Application.php

@@ -41,7 +41,7 @@ use Silex\Provider\HttpKernelServiceProvider;
  */
 class Application extends Container implements HttpKernelInterface, TerminableInterface
 {
-    const VERSION = '2.0.3-DEV';
+    const VERSION = '2.0.3';
 
     const EARLY_EVENT = 512;
     const LATE_EVENT = -512;