Preparing v0.2.0 Changelog before version release

CHANGELOG.md

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+# Fluux XMPP Changelog
+
+## v0.2.0
+
+### Changes
+
+- XMPP Over Websocket support
+- Add support for getting IQ responses to client IQ queries (synchronously or asynchronously, passing an handler
+  function).
+- Implement X-OAUTH2 authentication method. You can read more details here:
+  [Understanding ejabberd OAuth Support & Roadmap: Step 4](https://blog.process-one.net/understanding-ejabberd-oauth-support-roadmap/)
+- Fix issues in the stanza builder when trying to add text inside and XMPP node.
+- Fix issues with unescaped % characters in XMPP payload.
+
+### Code migration guide
+
+TODO