zulip/zulip/__init__.py: Remove shebang and add version assertion.
-#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import json
@@ -22,6 +21,9 @@ from typing import Any, Callable, Dict, Iterable, IO, List, Mapping, Optional, T
__version__ = "0.6.4"
+# Ensure the Python version is supported
+assert sys.version_info >= (3, 5)
+
logger = logging.getLogger(__name__)
# Check that we have a recent enough version
