Added changes.

changes.md

@@ -2,10 +2,13 @@
 
 ## Next version
 
+## Version 5.1.0: Attributes and dependencies
+
 - Renamed system tests to integration tests.
 - Added system test to verify proper handling of bad "start writing" messages.
 - Writer module attributes will now be ignored. If you want to set attributes of a parent group, do so directly.
 - Prioritisation has changed such that the *NX_class* of a parent group to a file-writer module will only be set if no such attribute is already set.
+- All the dependencies have been updated to their latest (conan) version as of 2022-05-23. This has required some changes and bug fixes in the application.
 
 
 ## Version 5.0.0: Usage and opinion