Update CHANGELOG.md (#580)

CHANGELOG.md

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 # Change log
 
+## 6.2.0
+
+### New Features
+
+#### All Editors
+
+* Ability to use Tab/Shift+Tab in some dialog windows
+* Change color of loader to darker one
+* Ability to setup font size 300pt (409pt for Spreadsheets)
+
+#### Document Editor
+
+* Ability to insert Table of Figures
+
+#### Spreadsheet Editor
+
+* Ability to insert slicers in pivot tables
+* Data Validation settings
+* Ability to cancel auto-expansion of tables
+* Support of custom number format
+* GROWTH, TREND, LOGEST, UNIQUE, RANDARRAY functions support
+
+#### Presentation Editor
+
+* Ability to setup auto-format as you type
+* Buttons for increase-decrease font size
+
+### Fixes
+
+* All editors received countless fixes
+
+
 ## 6.1.0
 
 ### New Features