chore: Updated CHANGELOG.md

The CHANGELOG.md was missing the [Unreleased] section, I added it back ^^

Author: Mitul16

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 The Changelog starts with v0.4.1, because we did not keep one before that,
 and simply didn't have the time to go back and retroactively create one.
 
+## [Unreleased]
+### Fixed
+- Fixed `shlex.join` use with non-str type objects (e.g. `RemotePath`)
+- Fixed `set` command use with incorrect keys (e.g. `set invalid value`)
+
+### Added
+- Added missed `PlatformError` for `upload` command (e.g. "no gtfobins writers available")
+
 ## [0.5.4] - 2022-01-27
 Bug fix for the `load` command.