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.