See also http://pvp.haskell.org/faq

0.2.0.0

• Semantic change: Switch to base64-bytestring-0.2.0 which provides stricter Base64 decoding semantics regarding padding.

• Add support for encoding/decoding to/from unpadded base64url.

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0.1.0.0

• First version. Released on an unsuspecting world.