PHP 7 and increasing min PHP to 5.5 (#10)

* Allowing PHP 7 and increasing min PHP to 5.5
* Updating php-onehydra dependency to PHP7 version
* Increased minimum required twig dependency
* Fixing use of deprecated twig functionality

.travis.yml

@@ -2,14 +2,14 @@ language: php
 php:
   - 5.5
   - 5.6
-#  - 7.0
-#  - hhvm
+  - 7.0
+  - 7.1
 
 env: COVERAGE=0
 
 matrix:
   include:
-    - php: 5.6
+    - php: 7.1
       env: COVERAGE=1
 
 before_script:

Tests/Twig/Extension/OneHydraExtensionTest.php

@@ -40,7 +40,7 @@ public function testCheckThatTwigFunctionsAreRegistered()
         $twig->addExtension($extension);
 
         /** @var OneHydraExtension $ext */
-        $ext = $twig->getExtension('onehydra_extension');
+        $ext = $twig->getExtension(OneHydraExtension::class);
 
         $this->assertInstanceOf(OneHydraExtension::class, $ext);
 

composer.json

@@ -19,12 +19,12 @@
     }
   ],
   "require": {
-    "php": ">=5.3.9",
-    "amara/onehydra": "~0.2.0",
+    "php": ">=5.5.0,<8.0",
+    "amara/onehydra": "~0.3.0",
     "symfony/framework-bundle": "~2.3|~3.0",
     "doctrine/orm": "~2.2,>=2.2.3,<2.5",
     "doctrine/doctrine-bundle": "~1.4",
-    "twig/twig": "~1.23|~2.0"
+    "twig/twig": "~1.26|~2.0"
   },
   "require-dev": {
     "phpunit/phpunit": "~4.8"