Add CHANGELOG

CHANGELOG.md

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+# CHANGELOG
+
+## 0.2
+- Changed database schema.
+- Changed aprs app name to 'ogn-gateway-python'.
+- Moved repository to github-organisation glidernet.
+- Added exception handling to the packet parser.
+- Added some tests for ogn.gateway.client.
+- Added setup.py to build this package.
+- Added configuration via python modules.
+- Added scheduled tasks with celery.
+- Renamed command line option `db.updateddb` to `db.import_ddb`.
+- Added command line options `db.drop`, `db.import_file`, `db.upgrade`,
+  `logbook.compute` and `show.devices.stats`.
+
+## 0.1
+Initial version.