Deprecated property access

[royce777]

ethr-status-registry/src/EthrStatusRegistry.ts

Line 31 in 8117e6e

const keyEntries: string[] = didDoc.publicKey

DID resolver doesn't provide publicKey property anymore, therefore I am not able to perform revocation check for a VC, because the DID document that is passed to this method has directly the verificationMethod property.