prepared the 2.10.0 release

CHANGELOG

@@ -1,4 +1,4 @@
-* 2.10.0 (2019-XX-XX)
+* 2.10.0 (2019-05-14)
 
  * deprecated "if" conditions on "for" tags
  * added "filter", "map", and "reduce" filters (and support for arrow functions)

src/Environment.php

@@ -38,12 +38,12 @@ use Twig\TokenParser\TokenParserInterface;
  */
 class Environment
 {
-    const VERSION = '2.10.0-DEV';
+    const VERSION = '2.10.0';
     const VERSION_ID = 21000;
     const MAJOR_VERSION = 2;
     const MINOR_VERSION = 10;
     const RELEASE_VERSION = 0;
-    const EXTRA_VERSION = 'DEV';
+    const EXTRA_VERSION = '';
 
     private $charset;
     private $loader;