implement league/container

composer.json

@@ -14,5 +14,9 @@
         }
     ],
     "minimum-stability": "stable",
-    "require": {}
+    "require": {
+        "league/container": ">=5.2.0",
+        "psr/container": ">=2.0.2",
+        "psr/event-dispatcher": ">=1.0.0"
+    }
 }

src/Potter/Container.php

@@ -5,4 +5,5 @@ declare(strict_types=1);
 namespace Potter;
 
 final class Container
+    extends \League\Container\Container
 { }