Polish NEWS

NEWS.md

@@ -1,5 +1,14 @@
 # usethis (development version)
 
+* Internal helper `cran_version()`, used in functions such as
+  `use_release_checklist()` and `use_news_md()`, is more resilient to situations
+  where no CRAN mirror has been set (#1857).
+
+* Internal usage of `numeric_version()` now always provides character input,
+  rather than relying on implicit `as.character()` coercion. This is in reponse
+  to a request from CRAN to anticipate future solutions to
+  <https://bugs.r-project.org/show_bug.cgi?id=18548> (#1869).
+
 # usethis 2.2.0
 
 ## New functions