v1.3.0 - introduce serialization for Hash type.

[vmidyllic]

What's Changed

• Fix: validating same schema multiple times when it has $id by @cykoder in Fix: validating same schema multiple times when it has $id #142
• Fix/hash big int by @volodymyr-basiuk in Fix/hash big int #143
• toJSON / fromJSON logic defined for W3C credential, BJJ Signature proof and Iden3SparseMerkleTreeProof
• issuerData type removed due to the inefficiency, must not brake integration.

Full Changelog: v1.2.2...v1.3.0

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This discussion was created from the release v1.3.0 - introduce serialization for Hash type. .