eq-4.0: CHANGELOG.markdown

4.0
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* Updated to work with `semigroupoids` 4.0

3.1.1
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* Claim to be `Trustworthy`

3.1
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* Disabled observing injectivity through `TypeFamilies` for GHC >= 7.6

3.0.1
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* Updated build system
* Removed my personal intra-package dependency upper bounds
* Added `README` and `CHANGELOG`