Updated changelog for v4.0.0

CHANGELOG.md

@@ -15,10 +15,17 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - CFDP Packet Stack and related tests added. It also refactors the existing TMTC infastructure to
   allow sending of CFDP packets to the CCSDS handlers.
   PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/528
+- Linux Command Executor, which can execute shell commands in blocking and non-blocking mode
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/536
+- added virtual function to print datasets
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/544
 
 ## Changes
 
 - Applied the `clang-format` auto-formatter to all source code
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/534
+- Updated Catch2 to v3.0.0-preview4, might fail installing with cmake, see known bugs below
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/538
 
 ## Bugfix
 
@@ -30,6 +37,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Aforementioned changes to existing TMTC stack
 
+## Known bugs
+
+* on some platforms building Catch2 from cmake might fail. In this case, it is advised to build and
+  install locally from git, see automation/Dockerfile for an example
+
 # [v3.0.1]
 
 ## API Changes