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](urllib3/urllib3@1.24.1...1.24.2)

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

Author: dependabot[bot]

requirements-freeze.txt

@@ -20,5 +20,5 @@ snowballstemmer==1.2.1
 Sphinx==1.2.3
 sphinx-rtd-theme==0.4.2
 Unidecode==0.4.14
-urllib3==1.24.1
+urllib3==1.24.2
 sphinxcontrib-rubydomain