Update CHANGELOG.md (#720)

CHANGELOG.md

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 # Change log
+
+## 6.4.1
+
+### New Features
+* Major improvements in support of chart styles
+* Ability to Resolve all comments
+* Change list symbols render
+* Add chart styles for users with visual impairment
+* Add ability to use tab\shift+tab in some controls
+* Ability to view unique user link count on info page
+* Improved render of CJK fonts in PDF files
+
+### Document Editor
+* Ability to convert text to table
+* Ability to convert table to text
+* Auto-capitalize first letter
+* New review mode: Simple markup
+
+### Spreadsheet Editor
+* Ability to add/remove/edit conditional formatting
+* Ability to add sparklines
+* Change select by pressing `tab` + `enter`
+* Data import from txt, csv
+* Add setting for hyperlink auto-correction
+* Freeze panes presets
+* Setting for `show zeros` in cells
+* Chain comments support
+* Add argument names to function wizard
+
+### Presentation Editor
+* Version History
+* Ability to hide notes panel
+* Auto-capitalize first letter
+
+### Fixes
+* All components received countless fixes
+
+
 ## 6.3.1
 
 ### New Features