As discuss in this PR for windows sdk: https://github.com/aerogear/aerogear-windows-otp/pull/2
it will be nice to be able to configure the digits number for otp generation. This API need to be changed: https://github.com/aerogear/aerogear-otp-ios/blob/master/aerogear-otp.ios/Classes/AGTotp.h#L69
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