Add __version__ to apiclient.
diff --git a/apiclient/__init__.py b/apiclient/__init__.py
index f84974b..95be39e 100644
--- a/apiclient/__init__.py
+++ b/apiclient/__init__.py
@@ -10,3 +10,5 @@
 from googleapiclient import model
 from googleapiclient import sample_tools
 from googleapiclient import schema
+
+__version__ = apiclient.__version__