Update package description language

.github/CONTRIBUTING.md

@@ -1,5 +1,4 @@
 `usmapdata` is open to any of the following contributions:
-* Map data updates from official shape files
 * Augmentation or improvement of existing features
 * Bug fixes and code refactoring
 * Additional or improved documentation (especially new examples, typo fixes, clearer language, etc.)

DESCRIPTION

@@ -4,8 +4,8 @@ Version: 0.2.1.9999
 Description: Provides a container for data used by the 'usmap' package.
     The data used by 'usmap' has been extracted into this package so that the
     file size of the 'usmap' package can be reduced greatly. The data in this
-    package will be updated roughly once per year (plus bug fixes) as new
-    shapefiles are provided by the US Census bureau.
+    package will be updated roughly once per year as new map data files are 
+    provided by the US Census Bureau.
 Authors@R: person("Paolo", "Di Lorenzo", email = "dilorenzo@hey.com", role = c("aut", "cre"))
 Depends:
     R (>= 3.5.0)

NEWS.md

@@ -1,5 +1,8 @@
 # [unreleased]
 
+### Improvements
+* Improve language in `DESCRIPTION` and minor documentation, see [Issue #19](https://github.com/pdil/usmapdata/issues/19).
+
 ### Bug Fixes
 * `alaska_bbox()` and `hawaii_bbox()` now output correct `sf` type (`sfc polygon`).
 

R/create-us-map.R

@@ -52,13 +52,13 @@ create_us_map <- function(
 ) {
   # check for dplyr
   if (!requireNamespace("dplyr", quietly = TRUE)) {
-    stop("`dplyr` must be installed to use `dplyr`.
+    stop("`dplyr` must be installed to use `create_us_map()`.
          Use: install.packages(\"dplyr\") and try again.")
   }
 
   type <- match.arg(type)
 
-  # import map shape file
+  # import map file
   us <- sf::read_sf(input_file)
 
   # ea: US National Atlas Equal Area