Update version numbering from 1.6 to 2.0.
diff --git a/Doc/lib/libtempfile.tex b/Doc/lib/libtempfile.tex
index d1bc011..b3e528b 100644
--- a/Doc/lib/libtempfile.tex
+++ b/Doc/lib/libtempfile.tex
@@ -63,7 +63,7 @@
\end{funcdesc}
\begin{datadesc}{template}
-\deprecated{1.6}{Use \function{gettempprefix()} instead.}
+\deprecated{2.0}{Use \function{gettempprefix()} instead.}
When set to a value other than \code{None}, this variable defines the
prefix of the final component of the filenames returned by
\function{mktemp()}. A string of decimal digits is added to generate