Merge branch '3.3' into 3.4

* 3.3:
  Add empty "require-dev" to force its order

Author: nicolas-grekas

composer.json

@@ -29,6 +29,8 @@
         "symfony/web-link": "*",
         "symfony/yaml": "*"
     },
+    "require-dev": {
+    },
     "flex-require-dev": {
         "symfony/debug-pack": "*",
         "symfony/maker-bundle": "^1.0",