Bump twig/twig from 2.7.4 to 2.9.0

Bumps [twig/twig](https://github.com/twigphp/Twig) from 2.7.4 to 2.9.0.
- [Release notes](https://github.com/twigphp/Twig/releases)
- [Changelog](https://github.com/twigphp/Twig/blob/2.x/CHANGELOG)
- [Commits](https://github.com/twigphp/Twig/compare/v2.7.4...v2.9.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

composer.lock

@@ -4898,16 +4898,16 @@
         },
         {
             "name": "twig/twig",
-            "version": "v2.7.4",
+            "version": "v2.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "ed9c49220e09bfaeb1ba4d48077c08a7b09908dd"
+                "reference": "82a1c055c8ed4c4705023bfd0405f3c74db6e3ae"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig/zipball/ed9c49220e09bfaeb1ba4d48077c08a7b09908dd",
-                "reference": "ed9c49220e09bfaeb1ba4d48077c08a7b09908dd",
+                "url": "https://api.github.com/repos/twigphp/Twig/zipball/82a1c055c8ed4c4705023bfd0405f3c74db6e3ae",
+                "reference": "82a1c055c8ed4c4705023bfd0405f3c74db6e3ae",
                 "shasum": ""
             },
             "require": {
@@ -4923,7 +4923,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.7-dev"
+                    "dev-master": "2.9-dev"
                 }
             },
             "autoload": {
@@ -4961,7 +4961,7 @@
             "keywords": [
                 "templating"
             ],
-            "time": "2019-03-23T14:28:58+00:00"
+            "time": "2019-04-28T06:57:38+00:00"
         },
         {
             "name": "vlucas/phpdotenv",