Update the changelog

Author: cedx

ChangeLog.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Version [0.6.0](https://github.com/cedx/sql.ps1/compare/v0.5.1...v0.6.0)
+- Added the `New-DataMapper` cmdlet.
+- Fixed the deserialization of `Enum` and `Nullable` types.
+
 ## Version [0.5.1](https://github.com/cedx/sql.ps1/compare/v0.5.0...v0.5.1)
 - Fixed the `New-Command` cmdlet.