add change-note

Author: erik-krogh

ruby/ql/src/change-notes/2023-01-06-badly-anchored-regex.md

@@ -0,0 +1,5 @@
+---
+category: newQuery
+---
+* Added a new query, `rb/regex/badly-anchored-regexp` to detect regular expression validators that use `^` and `$` 
+  as anchors and thus might match a single line instead of the entire string.