Update __init__.py

metagpt/roles/__init__.py

@@ -9,6 +9,7 @@
 from metagpt.roles.role import Role
 from metagpt.roles.architect import Architect
 from metagpt.roles.project_manager import ProjectManager
+from metagpt.roles.product_manager import ProductManager
 from metagpt.roles.engineer import Engineer
 from metagpt.roles.qa_engineer import QaEngineer
 from metagpt.roles.seacher import Searcher
@@ -20,6 +21,7 @@ __all__ = [
     "Role",
     "Architect",
     "ProjectManager",
+    "ProductManager",
     "Engineer",
     "QaEngineer",
     "Searcher",