Provide Support for Stratigility for PHP 5.6 and 5.5

Author: Marco Bunge

.travis.yml

@@ -3,15 +3,15 @@ sudo: false
 language: php
 
 php:
-  - 5.5
   - 5.6
   - 7.0
+  - 7.1
   - hhvm
 
 matrix:
   fast_finish: true
   allow_failures:
-    php: 7.0
+    php: 7.1
 
 cache:
   directories:

composer.json

@@ -25,7 +25,7 @@
     }
   ],
   "require": {
-    "php": ">=5.5.0",
+    "php": ">=5.6",
     "filp/whoops": "~2.0",
     "league/route": "dev-master#507606b53d3935e7830aa7c48c43337bc2b1b2ba",
     "league/container": "~2.0",
@@ -38,7 +38,7 @@
     "phpunit/phpunit": "~4.8",
     "symfony/http-kernel": "~2.7|~3.0",
     "symfony/psr-http-message-bridge": "*",
-    "zendframework/zend-stratigility": "1.3.1"
+    "zendframework/zend-stratigility": "~1.1.2|~1.3.1"
   },
   "autoload": {
     "psr-4": {