Add ChangeLog entries

Author: eregon

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 New features:
 
+* Foreign strings now have all methods of Ruby `String`. They are treated as `#frozen?` UTF-8 Ruby Strings.
 
 Bug fixes:
 
@@ -14,6 +15,9 @@ Performance:
 
 Changes:
 
+* No more conversion between Java Strings and Ruby Strings at the interop boundary.
+* Removed `Truffle::Interop.{import_without_conversion,export_without_conversion}` (use `Polyglot.{import,export}` instead).
+* Removed `Truffle::Interop.members_without_conversion` (use `Truffle::Interop.members` instead).
 
 # 22.2.0