Bump flake8-tidy-imports from 2.0.0 to 3.0.0

Bumps [flake8-tidy-imports](https://github.com/adamchainz/flake8-tidy-imports) from 2.0.0 to 3.0.0.
- [Release notes](https://github.com/adamchainz/flake8-tidy-imports/releases)
- [Changelog](https://github.com/adamchainz/flake8-tidy-imports/blob/master/HISTORY.rst)
- [Commits](adamchainz/flake8-tidy-imports@2.0.0...3.0.0)

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

requirements-dev.txt

@@ -6,7 +6,7 @@
 coveralls==1.8.2
 flake8==3.7.8
 flake8-type-annotations==0.1.0
-flake8-tidy-imports==2.0.0
+flake8-tidy-imports==3.0.0
 mypy==0.730
 pytest==5.2.1
 pytest-asyncio==0.10.0