v0.2.0 Released

[sscovil]

This minor version bump was due to a change made to the return value of the server method verifyChallenge.

Originally, that method returned true if the challenge signer address matched the address in the payload of the valid JWT contained in the EIP-712 challenge message.

Now, that method returns the authenticated address on success, or null on failure.

These values still evaluate to true and false in a boolean context, which should minimize the impact of this breaking change. A major version bump from v0 to v1 seemed unwarranted here.