Bump urllib3 from 1.24.1 to 1.24.2

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.24.1 to 1.24.2.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/master/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.24.1...1.24.2)

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

requirements_dev.txt

@@ -62,7 +62,7 @@ toml==0.10.0
 tox==3.5.2
 tqdm==4.31.1
 twine==1.12.1
-urllib3==1.24.1
+urllib3==1.24.2
 virtualenv==16.4.3
 wadllib==1.3.3
 watchdog==0.9.0