Updated required php version to allow 5.5 (#22)

* Updated required php version to allow 5.5

* Updated doctrine/data-fixtures version in composer

* Updated travis.yml

Author: janmassive

.travis.yml

@@ -3,6 +3,12 @@ language: php
 matrix:
   fast_finish: true
   include:
+    - php: 5.5
+      env:
+        - STORAGE=doctrine
+    - php: 5.5
+      env:
+        - STORAGE=array
     - php: 5.6
       env:
         - STORAGE=doctrine

composer.json

@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": "~5.6 || ~7.0",
+        "php": "~5.5 || ~7.0",
         "php-task/php-task": "0.3.*",
         "symfony/http-kernel": "^2.6",
         "symfony/dependency-injection": "^2.6",
@@ -23,7 +23,7 @@
         "symfony/framework-bundle": "^2.6",
         "symfony/finder": "^2.6",
         "doctrine/doctrine-bundle": "^1.5",
-        "doctrine/data-fixtures": "^1.2"
+        "doctrine/data-fixtures": "^1.1"
     },
     "autoload": {
         "psr-4": {