python-dateutil version conflict in 0.4.6

[yukw777]

Describe the bug
I just did a clean, fresh install for flambe 0.4.6 and I see this error messsage:

botocore 1.13.13 has requirement python-dateutil<2.8.1,>=2.1; python_version >= "2.7", but you'll have python-dateutil 2.8.1 which is incompatible.

flambe itself works fine.

To Reproduce
Steps to reproduce the behavior:

1. pip install flambe==0.4.6
2. see the error message

Expected behavior
We shouldn't see any error message.

Software Versions (please complete the following information):

• OS: macOS 10.14.6
• Python Version: 3.7.4
• PyTorch Version: 1.1.0
• Flambé Version: 0.4.6

[tjjazzy14]

Today I received the same error for streamlit docker build.

Error Message:
streamlit 0.52.2 has requirement python-dateutil<=2.8.0, but you'll have python-dateutil 2.8.1 which is incompatible.