Update CHANGELOG.md

Author: MrClock8163

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+All notable changes in the Instrumentman project will be documented in this
+file.
+
+The project uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
 ## Unreleased
 
 ### Added
@@ -12,6 +17,10 @@
   - baud
   - timeout
 
+### Changed
+
+- all package dependencies now have their minimum compatible version specified
+
 ### Fixed
 
 - the connection test function in the `terminal` app did not work properly