Update Changelog

CHANGELOG.md

 # Change Log
 
+## 2021.1.1
+
+### Application
+
+   - Added `unsharp_method` to select unsharp mask method (gaussian or log)
+   - `enable_halftomo` can now be set to `auto` to let nabu determine if half aqcuisition was used
+
+### Library
+
+   - `scipy` is now a mandatory dependency
+
+
 ## 2021.1.0
 
 ### Application