Add Python grpcio protoc package
diff --git a/setup.py b/setup.py
index cd0d3a1..af9eb68 100644
--- a/setup.py
+++ b/setup.py
@@ -236,6 +236,7 @@
     'ext_modules': CYTHON_EXTENSION_MODULES,
     'packages': list(PACKAGES),
     'package_dir': PACKAGE_DIRECTORIES,
+    'namespace_packages': ['grpc'],
     'package_data': PACKAGE_DATA,
     'install_requires': INSTALL_REQUIRES,
     'setup_requires': SETUP_REQUIRES,