Pin gwdatafind to latest version 1.0.4

Created by: pyup-bot

This PR pins gwdatafind to the latest release 1.0.4.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/gwdatafind
• Docs: https://gwdatafind.readthedocs.io/