Update version in documentation.

Otherwise documentation has not changed.  The patch release just fixes
a problem, not introduce any functionality change.

UseLATEX.tex

@@ -2,7 +2,7 @@
 
 \documentclass{article}
 
-\newcommand{\UseLATEXVersion}{1.8.0}
+\newcommand{\UseLATEXVersion}{1.8.1}
 \newcommand{\SANDNumber}{SAND 2008-2743P}
 
 % This wonderful package allows hyphenation in tt fonts and hyphenation of