chore(*): update CHANGELOG.MD

Author: viktorkombov

CHANGELOG.md

@@ -1,7 +1,9 @@
 # Ignite UI for Angular Change Log
 
 All notable changes for each version of this project will be documented in this file.
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 ## 13.1.0
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 ### New Features
 - `igxTooltipTarget` directive now allows specifying a plain text tooltip without adding an additional DOM element decorated with the `igxTooltip` directive. This is achieved via the newly introduced `tooltip` string input.
     ```html