Ruby: Add change note

hmac · hmac · commit fdbe16945fee · 2022-08-04T17:19:05.000+12:00
diff --git a/ruby/ql/src/change-notes/2022-08-04-mime-type.md b/ruby/ql/src/change-notes/2022-08-04-mime-type.md
@@ -0,0 +1,5 @@
+---
+category: minorAnalysis
+---
+* Arguments to `Mime::Type#match?` and `Mime::Type#=~` are now recognised as
+  regular expression sources.
