Merge branch '4.3' into 4.4

* 4.3:
  fix Debug component dependencies
  [travis] not all components have a master branch
  [HttpKernel] Add @method PHPDoc for getRequest and getResponse back to Client

Author: xabbuh

composer.json

@@ -20,6 +20,7 @@
         "ext-xml": "*",
         "symfony/cache": "^4.3|^5.0",
         "symfony/config": "^4.2|^5.0",
+        "symfony/debug": "~4.0|^5.0",
         "symfony/dependency-injection": "^4.4|^5.0",
         "symfony/http-foundation": "^4.3|^5.0",
         "symfony/http-kernel": "^4.4|^5.0",