v0.3.0 Released

[sscovil]

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

Previously, that method returned null if verification failed for any reason. This made troubleshooting difficult, so it was modified to throw various errors that extend a new AuthError class instead.

Error Class	Description
InvalidJWTError	The EIP-712 message challenge JWT is invalid or expired.
InvalidMessageError	The unsigned EIP-712 message is invalid or does not match the expected format.
InvalidSignatureError	The signed EIP-712 message is invalid or does not match the expected format.
SignatureMismatchError	The EIP-712 message signer address does not match the challenge JWT address.

This is a pre-v1 breaking change, so it only gets a minor version bump.