Add changelog entry.

(cherry picked from commit 6b26431)

Author: aardvark179

CHANGELOG.md

@@ -22,6 +22,7 @@ Bug fixes:
 * Fixed `TruffleRuby.synchronized` to handle guest safepoints (#2277).
 * Fix control flow bug when assigning constants using ||= (#1489).
 * Fix `Kernel#raise` argument handling for hashes (#2298).
+* Set errinfo when `rb_protect` captures a Ruby exception (#2245).
 
 Compatibility: