Update dependencies to support Symfony 3

Author: petrepatrasc

.travis.yml

@@ -1,16 +1,13 @@
 language: php
 
 php:
-    - 5.3.3
-    - 5.3
-    - 5.4
     - 5.5
+    - 5.6
+    - 7.0
 
 env:
-    - SYMFONY_VERSION="2.0.*"
-    - SYMFONY_VERSION="2.1.*"
-    - SYMFONY_VERSION="2.2.*"
     - SYMFONY_VERSION="2.3.*"
+    - SYMFONY_VERSION="3.0.*"
 
 before_script:
     - composer self-update

composer.json

@@ -15,15 +15,16 @@
         }
     ],
     "require": {
-        "symfony/framework-bundle": "2.*",
+        "symfony/framework-bundle": "~2.3|~3.0",
         "widop/http-adapter": "1.1.*"
     },
     "require-dev": {
         "phpunit/phpunit": "3.7.*",
         "ext-curl": "*",
         "kriswallsmith/buzz": "*",
         "guzzle/guzzle": "*",
-        "zendframework/zend-http": "*"
+        "zendframework/zend-http": "*",
+        "php": ">=5.5.9"
     },
     "autoload": {
         "psr-0": { "Widop\\HttpAdapterBundle": "" }