New release: card.io 5.3.1 for iOS

[Bryant Luk]

Hello from card.io!

We have posted version 5.3.1 of card.io for iOS to github.

From the release notes:

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* Prevent an issue with crashes when an invalid IplImage is used for

  scanning causing an exception to be thrown later in cvGetSize().

  ( https://github.com/card-io/card.io-iOS-source/pull/57 )

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Please let us know if you discover any issues via GitHub!