Added changelog

CHANGELOG.md

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+# GitIssueBot Changelog
+
+## 0.2.0 (2015-03-02)
+
+### Features
+
+* Old trigger phrases can now be tracked along side with the current one, causing the issue to be validated but a
+  comment to be added to remind the user to review the adjusted contribution guidelines
+* New command ``autolabel``: Allows definition of a set of title tags (e.g. "[Request]") for which to apply defined
+  labels if found in an issue
+
+### Improvements
+
+* Also recognize changes in title tags and labels for validating a formerly invalidated issue
+
+### Bug Fixes
+
+* [#1](https://github.com/foosel/GitIssueBot/issues/1) - Pinned version numbers of dependencies to reduce risks of
+  breaking API changes
+* [#2](https://github.com/foosel/GitIssueBot/pull/2) - Explicitely using unicode for printing anything coming from the API
+* Unreported:
+  * Properly calculate, format and URL encode the ``since`` parameter for fetching issues
+  * Iterate through ``links`` provided by Github API to retrieve all issues, not just the first page
+  * Removed accidentally committed ``.pyc`` files
+
+([Commits](https://github.com/foosel/GitIssueBot/compare/0.1.0...0.2.0))
+
+## 0.1.0 (2014-07-27)
+
+Initial release