Update version numbering from 1.6 to 2.0.
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex
index 3e6e3cb..91afe4f 100644
--- a/Doc/lib/libfuncs.tex
+++ b/Doc/lib/libfuncs.tex
@@ -669,7 +669,7 @@
\code{u'a'}. This is the inverse of \function{ord()} for Unicode
strings. The argument must be in the range [0..65535], inclusive.
\exception{ValueError} is raised otherwise.
-\versionadded{1.6}
+\versionadded{2.0}
\end{funcdesc}
\begin{funcdesc}{unicode}{string\optional{, encoding='utf-8'\optional{, errors='strict'}}}
@@ -677,7 +677,7 @@
handling is done according to \var{errors}. The default behavior is
to decode UTF-8 in strict mode, meaning that encoding errors raise
\exception{ValueError}.
-\versionadded{1.6}
+\versionadded{2.0}
\end{funcdesc}
\begin{funcdesc}{vars}{\optional{object}}