Added the release version

Author: agronholm

CHANGES.rst

@@ -3,7 +3,7 @@ Version history
 
 This library adheres to `Semantic Versioning 2.0 <http://semver.org/>`_.
 
-**UNRELEASED**
+**1.2.0**
 
 - Added special monkeypatching if `Apport <https://github.com/canonical/apport>`_ has
   overridden ``sys.excepthook`` so it will format exception groups correctly