prepared the 1.37.1 release

CHANGELOG

@@ -1,4 +1,4 @@
-* 1.37.1 (2019-XX-XX)
+* 1.37.1 (2019-01-14)
 
  * fixed regression (key exists check for non ArrayObject objects)
  * fixed logic in TemplateWrapper

ext/twig/php_twig.h

@@ -15,7 +15,7 @@
 #ifndef PHP_TWIG_H
 #define PHP_TWIG_H
 
-#define PHP_TWIG_VERSION "1.37.1-DEV"
+#define PHP_TWIG_VERSION "1.37.1"
 
 #include "php.h"
 

lib/Twig/Environment.php

@@ -16,12 +16,12 @@
  */
 class Twig_Environment
 {
-    const VERSION = '1.37.1-DEV';
+    const VERSION = '1.37.1';
     const VERSION_ID = 13701;
     const MAJOR_VERSION = 1;
     const MINOR_VERSION = 37;
     const RELEASE_VERSION = 1;
-    const EXTRA_VERSION = 'DEV';
+    const EXTRA_VERSION = '';
 
     protected $charset;
     protected $loader;