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.txt

@@ -11,5 +11,5 @@ pytz==2018.7
 requests==2.21.0
 requests-toolbelt==0.8.0
 six==1.12.0
-urllib3==1.24.1
+urllib3==1.24.2
 zeep==3.1.0