Add unidata_version. Bump generator version number.
diff --git a/Doc/lib/libunicodedata.tex b/Doc/lib/libunicodedata.tex
index add00c9..a6d9d43 100644
--- a/Doc/lib/libunicodedata.tex
+++ b/Doc/lib/libunicodedata.tex
@@ -117,3 +117,10 @@
 \versionadded{2.3}
 \end{funcdesc}
 
+In addition, the module exposes the following constant:
+
+\begin{datadesc}{unidata_version}
+The version of the Unicode database used in this module.
+
+\versionadded{2.3}
+\end{datadesc}
\ No newline at end of file