vector-instances-3.4: CHANGELOG.markdown

3.4
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* Support `vector-0.12`
* Added `Hashable` instances.

3.3.1
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* Support `vector` 0.11

3.3.0.1
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* Support for GHC 7.10.1

3.3
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* Added more `Semigroup` instances.

3.2.1
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* Refactored build system.
* Removed bounds on dependencies.