Use a full UUID4 for the state param #93
Merged
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According to the hl7 SMART App Launch Implementation Guide:
The current state param used by this client is only 8 characters and, according to this entropy calculation, has only 41 bits of entropy.
The SMART App Launch Implementation Guide suggests using a "properly configured random uuid", which the uuid wiki indicates gives us the requisite 122 bits.
I'd like to have this in the 3.0 (STU3) version of the client, and also to merge it forward to master (R4).