Added changelog

CHANGELOG.md

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+# hubot-jira-servant changelog
+
+### Verson 1.2.0
+
+* As the Handlebars template is used to create a JSON (which is sent to Slack), there's now the Handlebars helper `safe` which will escape `"` and `\`. If you've customized the Handlebars template, please add the helper when printing variables. E.g. change `{{fields.summary}}` to `{{safe fields.summary}}`. Take a look at `changed-issues.hbs` for the default template.
+
+* Tabs in Jira responses are removed
+
+Thanks [Marc Abramowitz](https://github.com/msabramo) for all of the above.