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

1.1.0.0

• joinWith has been removed (#32)
• Bugfix: decode formerly allowed for padding chars to be interspersed in a valid base64-encoded string. This is now not the case, and it is fully spec-compliant as of #31
• The default behavior for Base64url decode is now to support arbitrary padding. If you need strict padded or unpadded decode semantics, use decodePadded or decodeUnpadded.
• Added strict unpadded and padded decode functions for Base64url (#30)
• Added unpadded encode for Base64url (#26).

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1.0.0.3

• Made performance more robust (#27).
• Improved documentation (#23).
• Improved the performance of decodeLenient a bit (#21).

1.0.0.2

• Fixed a write past allocated memory in joinWith (potential security issue).

0.1.1.0 - 1.0.0.1

• Changelog not recorded for these versions.

0.1.0.3

• Fixed: wrong encoding table on big-endian systems.
• Fixed: too big indices in encoding table construction.

0.1.0.2

• Changelog not recorded up to this version.