Allow twig/twig 2.0 (#74)

Twig 2.0 is out, let's allow it!

Author: greg0ire

composer.json

@@ -22,7 +22,7 @@
         "symfony/framework-bundle": "^2.7 || ^3.0",
         "symfony/twig-bundle": "^2.7 || ^3.0",
         "symfony/validator": "^2.7 || ^3.0",
-        "twig/twig": "^1.24"
+        "twig/twig": "^1.24 || ^2.0"
     },
     "suggest": {
         "symfony/form": "To use enum form type",

test/Bridge/Twig/Extension/EnumExtensionTest.php

@@ -33,11 +33,17 @@ protected function setUp()
 
     public function testEnvironment()
     {
-        $twig = new \Twig_Environment();
+        $twig = new \Twig_Environment($this->createMock(\Twig_LoaderInterface::class));
         $twig->addExtension($this->extension);
 
-        $this->assertTrue($twig->hasExtension('greg0ire_enum'));
         $this->assertInstanceOf(\Twig_SimpleFilter::class, $twig->getFilter('enum_label'));
+
+        if (version_compare(\Twig_Environment::VERSION, '1.26.0') === -1) {
+            $this->assertTrue($twig->hasExtension('greg0ire_enum'));
+
+            return;
+        }
+        $this->assertTrue($twig->hasExtension(EnumExtension::class));
     }
 
     /**