Bump urllib3 from 1.23 to 1.24.2

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.23 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@1.23...1.24.2)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

setup.py

@@ -48,7 +48,7 @@
     'tqdm==4.19.5',
     'typed-ast==1.1.0',
     'typing==3.6.4',
-    'urllib3==1.23',
+    'urllib3==1.24.2',
     'xlrd==1.1.0'
 ]