NEWS.md: mention "Freeze Regexp literals" [Feature #8948]

2020-01-15 12:43:49 +09:00 · 2020-01-15 12:43:49 +09:00 · 815807d2ab
--- a/NEWS.md
+++ b/NEWS.md
@ -26,6 +26,12 @@ Hash::

 ### Compatibility issues (excluding feature bug fixes)

+* Regexp literals are frozen [Feature #8948] [Feature #16377]
+
+```
+/foo/.frozen? #=> true
+```
+
 ### Stdlib compatibility issues (excluding feature bug fixes)

 ### C API updates