### [0.6.1](https://github.com/twada/empower-core/releases/tag/v0.6.1) (2016-06-05)


  * remove xtend from dependencies ([3341ef8](https://github.com/twada/empower-core/commit/3341ef8868c41544c95a621e57d4cefa1ad71ee2))


## [0.6.0](https://github.com/twada/empower-core/releases/tag/v0.6.0) (2016-05-29)


#### Features

  * update core-js to ^2.0.0 ([d152eef5](https://github.com/twada/empower-core/commit/d152eef51be1ba5c909ebe8394e24778ca4cf298))


## [0.5.0](https://github.com/twada/empower-core/releases/tag/v0.5.0) (2016-01-21)


#### Features

  * [Allow prototype enhancements](https://github.com/twada/empower-core/pull/7) (by [@jamestalmage](https://github.com/jamestalmage))
  * [Performance improvements](https://github.com/twada/empower-core/pull/8) (by [@jamestalmage](https://github.com/jamestalmage))


## [0.4.0](https://github.com/twada/empower-core/releases/tag/v0.4.0) (2016-01-10)


#### Features

  * [remove `_capt` and `_expr` from empower-core](https://github.com/twada/empower-core/pull/3)


## [0.3.0](https://github.com/twada/empower-core/releases/tag/v0.3.0) (2016-01-06)


#### Features

  * [Allow arbitrary data to be provided for a given pattern](https://github.com/twada/empower-core/pull/6) (by [@jamestalmage](https://github.com/jamestalmage))


## [0.2.0](https://github.com/twada/empower-core/releases/tag/v0.2.0) (2015-12-13)


#### Features

  * [Track non-enhanced assertions](https://github.com/twada/empower-core/pull/2) (by [@jamestalmage](https://github.com/jamestalmage))


## [0.1.0](https://github.com/twada/empower-core/releases/tag/v0.1.0) (2015-12-01)


#### Features

  * trying to extract core functionalities out ([60286bbf](https://github.com/twada/empower-core/commit/60286bbfae16ab9b6f0ff33a9de13cabd3c969d4))
  * just attach powerAssertContext, format it later ([319a4e9a](https://github.com/twada/empower-core/commit/319a4e9a1a64ff08fdeed17b243073d35ae6a18f))
  * add event handlers to options ([12bbf0d4](https://github.com/twada/empower-core/commit/12bbf0d44023340d9b6103b8df679ac2084f9ed2))
  * `modifyMessageBeforeAssert` option for compatibility ([c1ade361](https://github.com/twada/empower-core/commit/c1ade361ec4d26c9c05a8ee2c05155d0cea2c815))