Merge pull request #602 from FriendsOfCake/dependabot/pip/docs/urllib3-1.26.18

Bump urllib3 from 1.26.17 to 1.26.18 in /docs

Author: ADmad

docs/requirements.txt

@@ -15,5 +15,5 @@ snowballstemmer==1.2.1
 Sphinx==1.5.1
 sphinx-rtd-theme==0.1.9
 sphinxcontrib-phpdomain==0.2.1
-urllib3==1.26.17
+urllib3==1.26.18
 cakephp-theme