Update simplejson from 3.10.0 to 3.11.1

Author: pyup-bot

{{cookiecutter.project_slug}}/requirements.txt

@@ -40,7 +40,7 @@ pytz==2017.2
 PyYAML==3.12
 requests==2.11.1
 selenium==3.3.1
-simplejson==3.10.0
+simplejson==3.11.1
 six==1.10.0
 snowballstemmer==1.2.1
 Sphinx==1.5.5