Fix unit test defects by adding symfony/yaml (#155)

Author: andig

.gitignore

@@ -1,2 +1,5 @@
 /vendor/
-composer.lock
+composer.lock
+tests/Fixtures/Symfony/cache
+tests/Fixtures/Symfony/logs
+tests/Fixtures/Symfony/var

Bridges/HttpKernel.php

@@ -66,7 +66,7 @@ public function bootstrap($appBootstrap, $appenv, $debug)
     /**
      * {@inheritdoc}
      */
-    public function handle(ServerRequestInterface $request)
+    public function handle(ServerRequestInterface $request): ResponseInterface
     {
         if (null === $this->application) {
             // internal server error

composer.json

@@ -2,14 +2,15 @@
     "name": "php-pm/httpkernel-adapter",
     "license": "MIT",
     "require": {
-        "php-pm/php-pm": "^2.0",
+        "php-pm/php-pm": "dev-master",
         "symfony/http-foundation": "^3.4|^4.0",
         "symfony/http-kernel": "^3.4|^4.0",
         "guzzlehttp/psr7": "^1.5"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0",
-        "symfony/framework-bundle": "^3.4|^4",
+        "symfony/framework-bundle": "^3.4|^4.0",
+        "symfony/yaml": "^3.4|^4.0",
         "doctrine/annotations": "^1.6"
     },
     "autoload": {