v0.1.13: Option to update credential status is called `type`.

Add reason (optional) when updating credential status.

v0.1.12: Add custom logic for verify credentials.

Require an on-chain issue statement. The issue statement must be made within 5m of issuing the credential to prevent back dating (using a compromised key).
Give `unknown_status` error if there's no on-chain statement (within 5 minutes).
Give `issue_statement_elapsed` error if the statement is too late.
Give `suspended` error if credential is suspended.

v0.1.11

Call inner `createVerifiableCredentials` to add default properties be…

v0.1.10

Add LTO credential verifier

v0.1.9: Replace LTO credential plugin with credential manager.

Seems like this is the way intended by Veramo, but the implementation is incomplete.
`agent.credentialStatusGenerate()` needs to be called separately.

v0.1.8: Require keyRef for dispute and acknowledgement.

Load key directly and don't use issuer for those status updates.

v0.1.7

Require passing a credential plugin as argument when creating `LtoCre…

v0.1.6: Added LTO credential plugin.

Move LTO connection login to separate class.

v0.1.5

Don't sponsor own transactions

v0.1.4

Fixup