Release v0.3.0

• Change from cbor -> json
• Update sgx-helper rev, change cbor -> json
• Update advanca-sgx-helper
• Fix merge errors
• Add default-features = false
• Update sgx-helper tag to 0.4.0, bump version 0.3.0

Release v0.2.0

• add secure timestamp functionality
• add TCB message to signal required update
• update to advanca-sgx-helper v0.3.0
• convert aas privatekey to use EcdsaPrivateKey ASN.1 der format
• fix Dockerfile
• fix CI

v0.1.0

Advanca Attestation Service

• add a reference implementation providing attestation service for Advanca Worker
• add an attestee-client example
• add a service gRPC protocol