ch11-24: clean up by @eumiro & sync with Atlas

13-protocol-abc/typing/randompickload.py

@@ -0,0 +1,6 @@
+from typing import Protocol, runtime_checkable, Any, Iterable
+from randompick import RandomPicker
+
+@runtime_checkable  # <1>
+class LoadableRandomPicker(RandomPicker, Protocol):  # <2>
+    def load(self, Iterable) -> None: ...  # <3>