Add CHANGELOG [ci skip]

CHANGELOG.md

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+# Changelog
+
+## 0.3.0
+
+### Breaking changes
+`Playbook.stream` has been refactored to include a new `raise_on_failure` parameter. 
+This is part of a change in behaviour for this method to no longer raise exceptions by default 
+and stream the entire Playbook execution.
+
+To previous behaviour can be obtained by passing `raise_on_failure: :during` 
+to the `stream`method i.e.
+
+```ruby
+Playbook.stream "some_playbook.yml", raise_on_failure: :during
+```
+
+Alternatively, if you'd still like to raise exception for failures, but only after output has finished streaming, you can use:
+```ruby
+Playbook.stream "some_playbook.yml", raise_on_failure: :after
+```
+
+In addition to the breaking changes above,`Playbook.stream` now handles tasks that 
+are skipped according to Ansible's output. 
+This should include tasks which have `ignore_errors` set.