docs/conf.py: Set "version" and "release" to the same value.

We don't use alpha/beta/RC, so for us version and release should be the
same, or it leads to confusion (for example, current, 1.9.1 docs are
marked as 1.9 at places).

docs/conf.py

@@ -96,10 +96,9 @@ copyright = '2014-2017, Damien P. George, Paul Sokolovsky, and contributors'
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# The short X.Y version.
-version = '1.9'
-# The full version, including alpha/beta/rc tags.
-release = '1.9.1'
+# We don't follow "The short X.Y version" vs "The full version, including alpha/beta/rc tags"
+# breakdown, so use the same version identifier for both to avoid confusion.
+version = release = '1.9.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.