comonad-transformers-3.1: CHANGELOG.markdown

3.1
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* More instances for `Coproduct`

3.0.4
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* Removed unnecessary constraints in `Control.Comonad.Trans.Store`.

3.0.3
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* Marked modules Trustworthy as needed.

3.0.1
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* Removed upper bounds on my other dependencies
* Directory layout change
* Added support files
* Travis build notification to IRC

2.1
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* Removed Discont
* Switched to mkTyCon3
* Upgraded to transformers 0.3