Label slide as c++11 because we use enum class.

Author: hageboeck

talk/basicconcepts/classenum.tex

@@ -156,7 +156,7 @@
 \end{frame}
 
 \begin{frame}[fragile]
-  \frametitlecpp[98]{More sensible example}
+  \frametitlecpp[11]{More sensible example}
   \begin{multicols}{2}
     \begin{cppcode*}{}
       enum class ShapeType {