Fix a typo in the changelog

Author: byroot

CHANGES.md

@@ -5,7 +5,7 @@
 ### 2025-09-22 (2.15.0)
 
 * `JSON::Coder` callback now receive a second argument to convey whether the object is a hash key.
-* Tuned the floating point number generator to not use scientific notation as agressively.
+* Tuned the floating point number generator to not use scientific notation as aggressively.
 
 ### 2025-09-18 (2.14.1)