Require ^5.1.5 and revert to MASTER_REQUEST to stay compatible (#41)

* Usage of HttpKernelInterface::MAIN_REQUEST makes 5.3 the lowest compatible version

* Require ^5.1.5 and revert to MASTER_REQUEST to stay compatible

composer.json

@@ -3,8 +3,8 @@
     "description": "Middleware for adding request id to Symfony Request.",
     "license": "MIT",
     "require": {
-        "symfony/http-kernel": "^4.4.13||^5.1.5",
-        "symfony/http-foundation": "^4.4.7||^5.0.7",
+        "symfony/http-kernel": "^5.1.5",
+        "symfony/http-foundation": "^5.0.7",
         "ramsey/uuid": "^4.0"
     },
     "authors": [

src/Qandidate/Stack/RequestId.php

@@ -48,7 +48,7 @@ public function __construct(
     /**
      * {@inheritDoc}
      */
-    public function handle(Request $request, int $type = HttpKernelInterface::MAIN_REQUEST, bool $catch = true)
+    public function handle(Request $request, int $type = HttpKernelInterface::MASTER_REQUEST, bool $catch = true)
     {
         if (!$request->headers->has($this->header)) {
             $request->headers->set($this->header, $this->generator->generate());