Bump patch version

Author: aMarcireau

setup.py

@@ -28,7 +28,7 @@ def finalize_options(self):
 
 setuptools.setup(
     name="event_stream",
-    version="1.6.3",
+    version="1.6.4",
     url="https://github.com/neuromorphicsystems/event_stream",
     author="Alexandre Marcireau",
     author_email="alexandre.marcireau@gmail.com",