Add 3.11 (python#107)

* Hello 3.10 and welcome 3.11!

* bump README version

README.md

@@ -32,6 +32,7 @@ of Sphinx we're using where::
     3.7       sphinx==1.8.2  sphinx==1.8.2  ø                   needs_sphinx="1.6.6"  Sphinx==2.3.1  Sphinx==2.3.1
     3.8       sphinx==1.8.2  sphinx==1.8.2  ø                   needs_sphinx='1.8'    Sphinx==2.3.1  Sphinx==2.3.1
     3.9       sphinx==2.2.0  sphinx==2.2.0  sphinx==2.2.0       needs_sphinx='1.8'    Sphinx==2.3.1  Sphinx==2.3.1
+    3.10      sphinx==2.2.0  sphinx==2.2.0  sphinx==2.2.0       needs_sphinx='1.8'    Sphinx==2.3.1  Sphinx==2.3.1
     main      sphinx==2.2.0  sphinx==2.2.0  sphinx==2.2.0       needs_sphinx='1.8'    Sphinx==2.3.1  Sphinx==2.3.1
     ========  =============  =============  ==================  ====================  =============  ===============
 
@@ -47,4 +48,5 @@ of Sphinx we're using where::
     3.8       2.3.1    2.3.1  2.3.1    2.3.1  2.3.1  2.3.1  2.3.1    2.3.1  2.3.1
     3.9       2.3.1    2.3.1  2.3.1    2.3.1  2.3.1  2.3.1  2.3.1    2.3.1  2.3.1
     3.10      2.3.1    2.3.1  2.3.1    2.3.1  2.3.1  2.3.1  2.3.1    2.3.1  2.3.1
+    3.11      2.3.1    2.3.1  2.3.1    2.3.1  2.3.1  2.3.1  2.3.1    2.3.1  2.3.1
     ========  =======  =====  =======  =====  =====  =====  =======  =====  =====

build_docs.py

@@ -111,7 +111,10 @@ def title(self):
     Version("3.8", "3.8", "security-fixes", sphinx_version="2.4.4"),
     Version("3.9", "3.9", "stable", sphinx_version="2.4.4"),
     Version(
-        "3.10", "main", "in development", sphinx_version="3.2.1", sphinxopts=["-j4"]
+        "3.10", "3.10", "pre-release", sphinx_version="3.2.1", sphinxopts=["-j4"]
+    ),
+    Version(
+        "3.11", "main", "in development", sphinx_version="3.2.1", sphinxopts=["-j4"]
     ),
 ]