typo fix

Author: eddelbuettel

inst/NEWS.Rd

@@ -5,7 +5,7 @@
 
 \section{Changes in Rcpp version 1.0.0 (2018-11-05)}{
   \itemize{
-    \item Happy tenth birtday to Rcpp, and hello release 1.0 !
+    \item Happy tenth birthday to Rcpp, and hello release 1.0 !
     \item Changes in Rcpp API:
     \itemize{
       \item The empty destructor for the \code{Date} class was removed