add CHANGELOG bump version

CHANGELOG.md

+## 0.2.0
+
+### Release Notes
+
+Noc Tower moved from mercurial to git.
+
+### Features
+
+* License files added
+* docker-compose file prepared for development process
+* Playbook url added. Used to get ansible playbook from some source. Pip  [vcs](https://pip.pypa.io/en/stable/reference/pip_install/#vcs-support) semantics is used for it
+* Make `future -1` and `flake8` happy
+* Readme file was updated to reflect changes
+* Introduce environment var TOWER_DB_PATH used to specify path to config.db
+
+### Bugfixes
+
+* Add missed checks for environmnet name. 
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VERSION

-0.1a73
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+0.2.0
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