docs(changelog/2.6.1-beta): update changelog

Author: itsaky

changelogs/v2.6.1-beta.md

@@ -29,6 +29,8 @@ _No new additions in this release._
 - On-demand imports in Java files no longer cause the definition and reference providers to fail ([issue #1449](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1449), [issue #1211](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1211)).
 - Resolved a `NullPointerException` when publishing diagnostics to the editor ([issue #1462](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1462)).
 - Occasional `NullPointerException` when saving files has been addressed ([issue #1463](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1463)).
+- Fixed memory leaks caused due to `TSTree` instances not being closed by Java LSP.
+- Fixed a bug that cause build failures if the project had subprojects in sub-directories ([issue #1491](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1491)).
 
 ## Improvements
 
@@ -40,7 +42,7 @@ _No new additions in this release._
 
 ## Contributors
 
-- @raredeveloper ([PR #1439](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1439), [PR #1456](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1456), [PR #1470](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1470)).
+- @raredeveloper ([PR #1439](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1439), [PR #1456](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1456), [PR #1470](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1470), [PR #1487](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1487)).
 - @Rafael2616 ([PR #1442](https://github.com/AndroidIDEOfficial/AndroidIDE/issues/1442)).
 
 We believe that you'll have a delightful experience using AndroidIDE v2.6.1-beta!