minor changes to README and CHANGELOG

CHANGELOG.md

 # Changelog
 
 ## [0.3.1]
-### Added
-
-### Changed
-
-### Deprecated
-
-### Removed
 
-### Fixed
-## [0.3.0]
 ### Added
 - Reference support for type names within aspect files.
   - Usages are now highlighted.
@@ -24,7 +15,7 @@
   - Attributes and inter-type declarations are shown sorted by aspect.
   - There are toggle buttons to show or hide attributes, inter-type declarations and rewrites.
   - Note that things outside aspects, equations and some other elements are not yet included.
-- Support for IntelliJ IDEA 2022.2.
+- Support for IntelliJ IDEA 2022.3.
 
 ### Changed
 

README.md

 # JastAdd Language Support
 
 <!-- Plugin description -->
-This plugin provides support for [JastAdd](https://jastadd.org) and [Relational RAGs](http://relational-rags.eu)
+This plugin provides support for [JastAdd](https://jastadd.cs.lth.se/) and [Relational RAGs](http://relational-rags.eu)
 <!-- Plugin description end -->