Update changelog

Author: AMDmi3

CHANGES.md

@@ -3,6 +3,12 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## 1.2.0 - 2017-05-23
+* Enable position independent code so libversion can be used with shared libraries
+
+## 1.1.0 - 2017-03-30
+* Improved handling of keywords, including fixed handling of `patch`
+* Improved documentation
+
 ## 1.0.0 - 2017-03-16
-### Added
-* Initial release featuring single function ```version_compare_simple(v1, v2)```
+* Initial release featuring single function `version_compare_simple(v1, v2)`