Update CHANGELOG.md (#75)

Author: adangel

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## Next
 
-* **Bump required pmd-core version to 7.0.0-SNAPSHOT.**
+* **Bump required pmd-core version to 7.0.0-rc4.**
 
 **Fixed issues:**
 
@@ -15,6 +15,7 @@
 * [#68](https://github.com/pmd/pmd-designer/pull/68) Expose all properties with default values by [@jsotuyod](https://github.com/jsotuyod)
 * [#69](https://github.com/pmd/pmd-designer/pull/69) Perform the persistence asynchronously to not block the main (UI) thread #69 by [@adangel](https://github.com/adangel)
 * [#70](https://github.com/pmd/pmd-designer/pull/70) Fix drag and drop for tests case violations by [@adangel](https://github.com/adangel)
+* [#75](https://github.com/pmd/pmd-designer/pull/75) Update to PMD 7.0.0-SNAPSHOT (upcoming 7.0.0-rc4) by [@adangel](https://github.com/adangel)
 
 See https://github.com/pmd/pmd-designer/milestone/11