Update CHANGELOG for 1.1.0

Author: kylehughes

CHANGELOG.md

@@ -1,8 +1,15 @@
 # Changelog
 
-## [1.0.0](https://github.com/kylehughes/RomanNumeralKit/releases/tag/1.0.0)
+All notable changes to this project will be documented in this file.
 
-Released on 2019-08-28.
+## [1.1.0] - 2020-09-05
+
+### Changed
+
+- Improved performance of arithmetic functions.
+- Removed `dynamic` specific from library product.
+
+## [1.0.0] - 2019-08-28
 
 ### Added