Update __init__.py (#382)

Author: harupy

openai/__init__.py

@@ -33,6 +33,7 @@
     Moderation,
 )
 from openai.error import APIError, InvalidRequestError, OpenAIError
+from openai.version import VERSION
 
 if TYPE_CHECKING:
     from aiohttp import ClientSession
@@ -62,6 +63,7 @@
 )  # Acts as a global aiohttp ClientSession that reuses connections.
 # This is user-supplied; otherwise, a session is remade for each request.
 
+__version__ = VERSION
 __all__ = [
     "APIError",
     "Audio",