minor #11 drop support for PHP < 5.6 (xabbuh)

This PR was merged into the 2.1.x-dev branch.

Discussion
----------

drop support for PHP < 5.6

Commits
-------

762c37a drop support for PHP < 5.6

Author: xabbuh

.travis.yml

@@ -6,22 +6,17 @@ cache:
   directories:
     - $HOME/.composer/cache/files
 
-php:
-  - 5.4
-  - 5.5
-  - 5.6
-
 matrix:
   fast_finish: true
   include:
-    - php: 5.3
-      dist: precise
+    - php: 5.6
       env: deps="low"
     - php: 7.0
       env: xdebug="yes"
+    - php: 7.1
 
 before_install:
-  - if [[ "$TRAVIS_PHP_VERSION" != "hhvm" && "$xdebug" != "yes" ]]; then phpenv config-rm xdebug.ini; fi
+  - if [[ "$xdebug" != "yes" ]]; then phpenv config-rm xdebug.ini; fi
   - composer self-update
   - composer require 'phpunit/phpunit:^4.8.35|^5.4.3|^6.0' --dev --no-update
 

CHANGELOG.md

@@ -4,6 +4,8 @@ CHANGELOG
 2.1.0
 -----
 
+* dropped support for PHP < 5.6
+
 * allow `2.x` releases of the `php-xapi/model` package too
 
 2.0.0

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0",
+        "php": "^5.6 || ^7.0",
         "php-xapi/model": "^1.0 || ^2.0",
         "php-xapi/serializer": "^2.1.1",
         "symfony/serializer": "~2.8|~3.0"