Declare support for Symfony 5 and Twig 3 #123

Author: Ian Thomas

composer.json

@@ -15,13 +15,13 @@
     "require": {
         "php": ">=7.1.3",
         "ext-gd": "*",
-        "symfony/http-foundation": "~3.4 || ~4.2",
-        "symfony/form": "~3.4 || ~4.2",
-        "symfony/validator": "~3.4 || ~4.2",
-        "symfony/routing": "~3.4 || ~4.2",
-        "symfony/config": "~3.4 || ~4.2",
-        "symfony/twig-bridge": "~3.4 || ~4.2",
-        "twig/twig": "^1.41 || ^2.10",
+        "symfony/http-foundation": "~3.4 || ~4.2 || ~5.0",
+        "symfony/form": "~3.4 || ~4.2 || ~5.0",
+        "symfony/validator": "~3.4 || ~4.2 || ~5.0",
+        "symfony/routing": "~3.4 || ~4.2 || ~5.0",
+        "symfony/config": "~3.4 || ~4.2 || ~5.0",
+        "symfony/twig-bridge": "~3.4 || ~4.2 || ~5.0",
+        "twig/twig": "^1.41 || ^2.10 || ~3.0",
         "twig/extensions": "~1.0",
         "friendsofsymfony/jsrouting-bundle": "@stable",
 	    "jms/translation-bundle": "^1.2.2"