Refactor Verifiable Credential structures

What's Changed

• Chore/prerelease update by @vmidyllic in #21
• IDEN-298: add subject position to credential struct by @ilya-korotya in #20

New Contributors

• @ilya-korotya made their first contribution in #20

Full Changelog: v0.0.23...v0.0.24

Change data structures for verifiable proofs

Merge pull request #18 from iden3/feature/update-sig-proof

Feature/update sig proof

Add types for zero knowledge proof / request

Merge pull request #17 from iden3/chore/protocol-support

add revocation status and proofs

v0.0.21

Upgrade github.com/iden3/go-merkletree-sql to v1.0.1

support latest iden3-core-lib

Merge pull request #15 from iden3/feature/bump-go-iden3-core

core-lib bumb

support zk types [draft]

v0.0.19

add revocation status and proofs

Upgrade go-iden3-core to v0.0.13

Merge pull request #14 from iden3/iden232

IDEN-232 upgrade go-iden3-core to v0.0.13

New schema approach support

Merge pull request #13 from iden3/feature/new-schema-approach

fix сreateSchemaHash

Support IPFS loader

Merge pull request #11 from iden3/feature/iden-210

feature/iden-210: IPFS SCHEMA LOADER

support ETH loader

A new loader is available.
It loads a schema from an ethereum smart contract.

Interface for HTTP loader is also changed