Bump sphinx-issues from 1.1.0 to 1.2.0

Bumps [sphinx-issues](https://github.com/sloria/sphinx-issues) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/sloria/sphinx-issues/releases)
- [Commits](sloria/sphinx-issues@1.1.0...1.2.0)

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

Author: dependabot-support

docs/requirements.txt

@@ -1,4 +1,4 @@
 
 sphinx==1.8.3
 PyYAML==3.13
-sphinx-issues==1.1.0
+sphinx-issues==1.2.0