Merge pull request #12 from camuthig/upgrade-statigility

Update Stratigility to 3.0

Author: Alexander Miertsch

composer.json

@@ -24,12 +24,12 @@
     "prooph/humus-amqp-producer": "^2.0",
     "zendframework/zend-stdlib": "^3.1.0",
     "zendframework/zend-config-aggregator": "^0.2.0",
-    "zendframework/zend-stratigility": "^2.0",
-    "zendframework/zend-expressive-helpers": "^4.0",
+    "zendframework/zend-stratigility": "^3.0",
+    "zendframework/zend-expressive-helpers": "^5.0",
     "nikic/fast-route": "^1.0",
     "psr/log": "^1.0",
     "monolog/monolog": "^1.21",
-    "http-interop/http-middleware": "^0.5"
+    "psr/http-server-middleware": "^1.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^6.0"