bumped to version 6.16.4
diff --git a/setup.py b/setup.py
index 787911e..72e2c1f 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 from pip.req import parse_requirements
 
-version = "6.16.3"
+version = "6.16.4"
 requirements = parse_requirements("requirements.txt", session="")
 
 setup(