Add NEWS re: ListOf<T>

Author: kevinushey

inst/NEWS.Rd

@@ -2,6 +2,16 @@
 \title{News for Package 'Rcpp'}
 \newcommand{\cpkg}{\href{http://CRAN.R-project.org/package=#1}{\pkg{#1}}}
 
+\section{Changes in Rcpp version 0.11.4 [UNRELEASED]}{
+  \itemize{
+    \item Changes in Rcpp API:
+    \itemize{
+      \item The \code{ListOf<T>} class gains the \code{.attr} and
+      \code{.names} methods common to other Rcpp vectors.
+    }
+  }
+}
+
 \section{Changes in Rcpp version 0.11.3 (2014-09-27)}{
   \itemize{
     \item Changes in Rcpp API: