v1.2.0
------

  * Support PowerTrack v2
    - Rule validator and Replay v2 not supported yet

v1.1.1
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  * Support retries in Replay mode

v1.1.0
------

  * Add support for Replay feature

v1.0.3
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  * Retrieve the on_system function from options

v1.0.2
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  * to_json can get options in order for powertrack to support the standard
    JSON library (through the MultiJson gem). Thanks to @duncanita for the PR.