Update changeLog

CHANGELOG.md

@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Removed duplicated entries from generated `.dep` files
 
 ### Other changes
+* removed `e3.cfg`, `ess-env.conf` and `DEFINES_REQUIRE` files and associated codes in `RULES_REQUIRE`, `setE3Env.bash` and `.gitignore`. 
 * removed legacy code from setE3Env.bash
 * Removed usage of `env.sh` - now there is a check only for seeing if the environment variable `$IOCNAME` is set
 * Fix typos in `iocsh_functions.bash` comments