Bump croniter from 0.3.32 to 0.3.34

Bumps [croniter](https://github.com/kiorky/croniter) from 0.3.32 to 0.3.34.
- [Release notes](https://github.com/kiorky/croniter/releases)
- [Changelog](https://github.com/kiorky/croniter/blob/master/docs/CHANGES.rst)
- [Commits](kiorky/croniter@0.3.32...0.3.34)

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

requirements.txt

@@ -7,14 +7,15 @@
 attrs==18.1.0             # via pytest
 click==7.1.2              # via -r requirements.in, pip-tools
 coverage==5.0.4           # via pytest-cov
-croniter==0.3.31          # via -r requirements.in
+croniter==0.3.34          # via -r requirements.in
 entrypoints==0.3          # via flake8
 flake8-isort==3.0.0       # via -r requirements.in
 flake8==3.7.9             # via -r requirements.in, flake8-isort
 importlib-metadata==1.5.0  # via pluggy, pytest
 isort[pyproject]==4.3.21  # via flake8-isort
 mccabe==0.6.1             # via flake8
 more-itertools==4.1.0     # via pytest
+natsort==7.0.1            # via croniter
 packaging==20.3           # via pytest
 pip-tools==5.1.2          # via -r requirements.in
 pluggy==0.13.1            # via pytest