chore(*): adding changelog

Author: kdinev

CHANGELOG.md

@@ -33,6 +33,12 @@ All notable changes for each version of this project will be documented in this
 - `IgxColumnActionsComponent`
     - **Breaking Change** - The following input has been removed
         - Input `columns`. Use `igxGrid` `columns` input instead.        
+
+## 12.2.2
+
+### General
+- **Breaking Change** - `IgxPercentSummaryOperand` and `IgxCurrencySummaryOperand` have been removed and `IgxNumberSummaryOperand` should be used instead. If you have used the percent or currency summary operands to extend a custom summary operand from them, then change the custom operand to extend from the number summary operand.
+
 ## 12.2.1
 
 ### New Features