Bump pytz from 2019.3 to 2020.1

Bumps [pytz](https://github.com/stub42/pytz) from 2019.3 to 2020.1.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](https://github.com/stub42/pytz/compare/release_2019.3...release_2020.1)

requirements.txt

@@ -24,7 +24,7 @@ pytest-lazy-fixture==0.6.3
 pytest==5.3.5
 python-dateutil==2.8.1
 python-intervals==1.10.0
-pytz==2019.3
+pytz==2020.1
 PyWavelets==1.1.1
 scikit-learn==0.22.1
 scipy==1.4.1