Merge pull request #326 from domaframework/dependabot/pip/docs/urllib3-1.24.2

Bump urllib3 from 1.24.1 to 1.24.2 in /docs

Author: nakamura-to

docs/requirements.txt

@@ -24,5 +24,5 @@ sphinx-autobuild==0.7.1
 sphinx-rtd-theme==0.4.2
 sphinxcontrib-websupport==1.1.0
 tornado==5.1.1
-urllib3==1.24.1
+urllib3==1.24.2
 watchdog==0.9.0