🎨 update available APIs

Author: ff137

README.md

@@ -129,18 +129,18 @@ Currently the following top-level APIs are available in the client. Each api map
 - `default`
 - `did_exchange`
 - `discover_features`
-- `discover_features_v20`
+- `discover_features_v2_0`
 - `endorse_transaction`
 - `introduction`
-- `issue_credential_v10`
-- `issue_credential_v20`
+- `issue_credential_v1_0`
+- `issue_credential_v2_0`
 - `jsonld`
 - `ledger`
 - `mediation`
 - `multitenancy`
 - `out_of_band`
-- `present_proof_v10`
-- `present_proof_v20`
+- `present_proof_v1_0`
+- `present_proof_v2_0`
 - `resolver`
 - `revocation`
 - `schema`