Update CHANGELOG.md

Author: baldwicc

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+### v1.1.1
+
+#### Fixes
+
+* [#254](https://github.com/dbt-msft/dbt-sqlserver/pull/254) adds converter for DATETIMEOFFSET which does not have native support in pyodbc ([@baldwicc](https://github.com/baldwicc))
+
 ### v1.1.0
 
 See changes included in v1.1.0rc1 below as well