update changelog

Author: patinthehat

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to `coverage-check` will be documented in this file.
 
 ---
 
+## 1.2.0 - 2021-07-23
+
+- add `--precision/-p` option flag to allow the precision used when calculating the code coverage percentage to be specified
+
 ## 1.1.0 - 2021-07-04
 
 - add `--metric/-m` option flag