Update CHANGELOG

Author: jyn514

CHANGELOG.md

@@ -9,6 +9,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - New method `Toolchain::remove_component`
 
+### Fixed
+
+- When passed a global command with the same name as a file in the current directory,
+Rustwide will now execute the global command instead of the file.
+
 ## [0.8.0] - 2020-06-05
 
 ### Added