Sphinx docs now pull version info from git tag

Based on http://dreamiurg.net/2011/10/03/using-git-to-get-version-information/

docs/conf.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-#
+
+from subprocess import Popen, PIPE
+
 # This file is execfile()d with the current directory set to its
 # containing dir.
 #
@@ -52,9 +54,15 @@ author = "Simon Willison"
 # built documents.
 #
 # The short X.Y version.
-version = ""
-# The full version, including alpha/beta/rc tags.
-release = ""
+pipe = Popen("git describe --tags --always", stdout=PIPE, shell=True)
+git_version = pipe.stdout.read().decode("utf8")
+
+if git_version:
+    version = git_version
+    release = git_version
+else:
+    version = ""
+    release = ""
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.