Update changelog

CHANGELOG.md

@@ -13,11 +13,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Fixed an issue where .template and .substitutions files with the same name would build incorrectly
 * Fixed an issue where filenames with spaces in them that had been modified
 in the wrapper would cause all of the module `make` commands to fail.
+* Removed a number of memory leaks found by valgrind
 
 ### Other changes
 
 * Replaced `tclx` script to expand .dbd files with a python script
 * Removed `hdrs` target. Note that this has been entirely replaced by the automatic db expansion.
+* Removed ability to pass `args` to require (which have not been used within e3)
+* Removed `require module,ifexists` option
+* Stop require from looking in legacy locations for various files
 
 ## [5.0.0]