Bump pymatgen from 2020.7.3 to 2020.7.10

Bumps [pymatgen](https://github.com/materialsproject/pymatgen) from 2020.7.3 to 2020.7.10.
- [Release notes](https://github.com/materialsproject/pymatgen/releases)
- [Changelog](https://github.com/materialsproject/pymatgen/blob/master/CHANGES.rst)
- [Commits](materialsproject/pymatgen@v2020.7.3...v2020.7.10)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -1,4 +1,4 @@
-pymatgen==2020.7.3
+pymatgen==2020.7.10
 pandas==1.0.5
 tensorflow==2.2.0
 numpy==1.19.0