Update CHANGELOG.md for version 4.2.0

CHANGELOG.md

@@ -1,5 +1,41 @@
 # Change log
 
+## 4.2.0
+## New Features
+### All Editors
+* Ability to set dash type for shapes
+* Redesigned embedded viewers
+* Better support of HiDPI systems
+
+### Document Editor
+* Ability to set `Fit to Page` and `Fit to Width` as default zoom value
+* Ability to open and edit Footnotes
+* Redone Version History. Ability to hide minor features.
+
+### Spreadsheet Editor
+* Add ability to insert Equations in Spreadsheet Editor
+* Add new formula `SUMIFS`
+* Ability to select data from drop-down menu in context menu
+* Add multiselect support
+* Add rotation of 3D Charts
+* Update and improve visual styles for all chart types
+* Bring back `Freeze Panes` in `View Settings` menu
+* New algorithm for calculating cell height
+
+### Presentation Editor
+* Ability to set `Fit to Width` as default zoom value
+* Add ability to insert Equations in Presentation Editor
+
+### Back-end
+* Update `nodejs` from 4.2.0 to current LTS release: 6.9.1
+
+## Fixes
+### Spreadsheet Editor
+* Fixed issue [#63](https://github.com/ONLYOFFICE/DocumentServer/issues/63)
+
+### x2t
+* Fixed issue [#55](https://github.com/ONLYOFFICE/DocumentServer/issues/55)
+
 ## 4.1.8
 ### Fixes
 #### License