Update docs to include Puerto Rico

Author: pdil

R/usmapdata-package.R

@@ -2,12 +2,12 @@
 #'
 #' @description
 #' It is usually difficult or inconvenient to create US maps that
-#'   include both Alaska and Hawaii in a convenient spot. All map
+#'   include Alaska, Hawaii, and even Puerto Rico in a convenient spot. All map
 #'   data frames produced by this package use the US National Atlas Equal Area
 #'   projection.
 #'
 #' @section Map data frames:
-#' Alaska and Hawaii have been manually moved to a new location so that
+#' Alaska, Hawaii, and Puerto Rico have been manually moved to a new location so that
 #' their new coordinates place them to the bottom-left corner of
 #' the map. These maps can be accessed by using the \link{us_map} function.
 #'