exclude the performance package

Author: bollwyvl

setup.py

@@ -38,7 +38,7 @@
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
     ],
-    packages=find_packages(),
+    packages=find_packages(exclude=["performance"]),
     include_package_data=True,
     entry_points={
         "jupyterhub.proxies": [