Updated changelog for v2.1.1

Author: s1hofmann

CHANGELOG.md

@@ -2,9 +2,14 @@
 
 All notable changes to this project will be documented in this file.
 
-## @next
+## 2.1.1
 
-- Bugfix: Fix off-by-one error when specifying the full screen region in `screen.capture` [(#45)](https://github.com/nut-tree/libnut/issues/45)
+- Enhancement: Snapshot releases [(#4)](https://github.com/nut-tree/libnut/issues/4)
+- Enhancement: Update CI configs [(#7)](https://github.com/nut-tree/libnut/issues/7)
+- Enhancement: Split OS specific implementation into separate files [(#20)](https://github.com/nut-tree/libnut/issues/45)
+- Enhancement: Enable GitHub Actions [(#40)](https://github.com/nut-tree/libnut/issues/40)
+- Enhancement: Trigger snapshot build for https://github.com/nut-tree/libnut-install after snapshot release [(#42)](https://github.com/nut-tree/libnut/issues/42)
+- Bugfix: Region captures can't capture the whole screen [(#45)](https://github.com/nut-tree/libnut/issues/45)
 
 ## 2.1.0