Fix type signature of read_problems (#9)

Author: Linyxus

human_eval/data.py

@@ -8,7 +8,7 @@
 HUMAN_EVAL = os.path.join(ROOT, "..", "data", "HumanEval.jsonl.gz")
 
 
-def read_problems(evalset_file: str = HUMAN_EVAL) -> Iterable[Dict[str, Dict]]:
+def read_problems(evalset_file: str = HUMAN_EVAL) -> Dict[str, Dict]:
     return {task["task_id"]: task for task in stream_jsonl(evalset_file)}