Merge pull request #1103 from python-trio/dependabot/pip/sphinx-2.1.1

Author: dependabot-preview[bot]

docs-requirements.txt

@@ -29,7 +29,7 @@ sniffio==1.1.0
 snowballstemmer==1.2.1    # via sphinx
 sortedcontainers==2.1.0
 sphinx-rtd-theme==0.4.3
-sphinx==2.1.0
+sphinx==2.1.1
 sphinxcontrib-applehelp==1.0.1  # via sphinx
 sphinxcontrib-devhelp==1.0.1  # via sphinx
 sphinxcontrib-htmlhelp==1.0.2  # via sphinx
@@ -40,3 +40,5 @@ sphinxcontrib-trio==1.1.0
 toml==0.10.0              # via towncrier
 towncrier==19.2.0
 urllib3==1.25.3           # via requests
+
+#