Update changelog.md

changelog.md

@@ -2,7 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
-## [0.24] - 2021-10-12
+## [0.26] - 2021-10-12
+- increase thread pool sizes from 1 to 4
+
+## [0.25] - 2021-10-12
 - POL1-463: bugfixes
 
 ## [0.24] - 2021-10-11