Pin george to latest version 0.4.3

[pyup-bot]

This PR pins george to the latest release 0.4.3.

Changelog

0.4.0

++++++++++++++++++

- Updated packaging and installation issues
- Updated CI and Python version testing

0.3.1

++++++++++++++++++

- Fixed issue where george would not compile with GCC<4.9 because of a
compiler bug
- Fixed bug when re-using HODLR factorizations

0.3.0

++++++++++++++++++

- New modeling protocol for parameter fitting
- Rewritten HODLR algorithm - more stable and better performance
- New interface for "easily" implementing new kernel functions

pre-0.3
+++++++

- This project has had a long and tumultuous history

Links

• PyPI: https://pypi.org/project/george
• Changelog: https://data.safetycli.com/changelogs/george/