Add CHANGELOG.md

Author: dubek

CHANGELOG.md

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+# Change log
+
+## v0.2 (2016-07-01)
+
+* Add `-full` option to dump the message header and properties into
+  `msg-NNNN-headers+properties.json` files - from
+  [@sshaw](https://github.com/sshaw).
+* README clarifications - from [@kruppel](https://github.com/kruppel).
+* Add amqp package is vendored using git submodule.
+
+
+## v0.1 (2014-11-11)
+
+* Initial release.