CHANGELOG.md in petitest-0.2.0 vs CHANGELOG.md in petitest-0.2.1

@@ -1,4 +1,13 @@
+## v0.2.1
+
+- Add `after_running_test_group` and `before_running_test_group` events
+- Add `Petitest::TestGroup#nest_level`
+- Add `Petitest::TestGroup#sub_test_group`
+- Add document style report
+- Improve error report format
+- Improve default `#assert` message
+
 ## v0.2.0
 
 - Merge errors into failures
 - Change test message interface
 - Remove utility assertions except for `#assert`