Update presentation.tex

doc/omlw2014/presentation.tex

@@ -319,8 +319,7 @@ print f([0, 1, 2])
 \begin{frame}[fragile]
   \frametitle{Simple example}
 
-\lstset{language=yaml,
-        commentstyle=\itshape\color{blue}
+\lstset{commentstyle=\itshape\color{blue}
         }
 \begin{lstlisting}
 !obj:pylearn2.train.Train {