Update sphinx-notfound-page from 0.4 to 0.5

Author: pyup-bot

docs/requirements.txt

@@ -4,5 +4,5 @@ sphinx-rtd-theme==0.5.0
 sphinx-tabs==1.1.13
 sphinx-prompt==1.1.0
 sphinx-version-warning==1.1.2
-sphinx-notfound-page==0.4
+sphinx-notfound-page==0.5
 sphinx-autobuild==0.7.1