prepared the 2.3.3 maintenance release

doc/changelog.rst

 Changelog
 =========
 
-2.3.3 (2019-XX-XX)
+2.3.3 (2019-11-25)
 ------------------
 
- * n/a
+ * Replace Fig/Link with Symfony\Component\WebLink
+ * Don't extend final SessionListener and TestSessionListener. Extend the abstract base classes instead.
 
 2.3.2 (2019-10-11)
 ------------------

src/Silex/Application.php

@@ -41,7 +41,7 @@ use Silex\Provider\HttpKernelServiceProvider;
  */
 class Application extends Container implements HttpKernelInterface, TerminableInterface
 {
-    const VERSION = '2.3.3-DEV';
+    const VERSION = '2.3.3';
 
     const EARLY_EVENT = 512;
     const LATE_EVENT = -512;