Update travis

Author: barryvdh

.travis.yml

@@ -1,20 +1,20 @@
 language: php
 
 php:
-  - 5.3
-  - 5.4
-  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
+  - hhvm
 
 env:
-  - SYMFONY_VERSION="2.1" GUZZLE_VERSION="3.1"
-  - SYMFONY_VERSION="2.*" GUZZLE_VERSION="3.1"
-  - SYMFONY_VERSION="2.1" GUZZLE_VERSION="3.*"
-  - SYMFONY_VERSION="2.*" GUZZLE_VERSION="3.*"
+  - SYMFONY_VERSION="2.1"
+  - SYMFONY_VERSION="2.*"
+  - SYMFONY_VERSION="3.0"
+  - SYMFONY_VERSION="3.*"
 
 before_script:
   - composer self-update
   - composer --version
   - composer require symfony/http-foundation:${SYMFONY_VERSION} --no-update
-  - composer require guzzle/http:${GUZZLE_VERSION} --no-update
 
 script: composer install -n --dev --prefer-source