Add CHANGELOG notes for version 3.2.0

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Add CHANGELOG notes for version 3.1.0

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Add CHANGELOG notes for version 3.0.1

Add Contributing and License sections to the README

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Update CHANGELOG for version 3.0.0-beta1

Bump version for 2.8.3 release

Update CHANGELOG for version 3.0.0-alpha3

Update CHANGELOG for version 3.0.0-alpha2

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Update CHANGELOG for 2.8.2 release