Update CHANGELOG notes for version 3.5.0

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Updating CHANGELOG notes for version 3.4.1

Update CHANGELOG notes for version 3.4.0

Update CHANGELOG notes for version 3.3.0

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Merge pull request ramsey#100 from ramsey/2.x/random_compat

Drop OpenSSL support and use paragonie/random_compat

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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