Remove unused dependency

Hitoshi Harada · Hitoshi Harada · commit 7da2b0667792 · 2018-07-27T00:44:27.000-07:00
diff --git a/setup.py b/setup.py
@@ -27,7 +27,6 @@
     install_requires=[
         'asyncio-nats-client',
         'pandas',
-        'python-dateutil',
         'requests',
         'urllib3',
         'websocket-client',
