moved the debug alias to the pack instead of the bundle

symfony/debug-bundle/3.3/manifest.json

@@ -1,6 +1,5 @@
 {
     "bundles": {
         "Symfony\\Bundle\\DebugBundle\\DebugBundle": ["dev", "test"]
-    },
-    "aliases": ["debug"]
+    }
 }

symfony/debug-pack/1.0/manifest.json

@@ -0,0 +1,3 @@
+{
+    "aliases": ["debug"]
+}