message: Changed construction of JSON array in inmem wallet.
diff: @@ -3,6 +3,7 @@ package org.hyperledger.indy.sdk.wallet;
  import java.util.Date;
  import java.util.Iterator;
  import java.util.Map;
  +import java.util.StringJoiner;
  import java.util.concurrent.ConcurrentHashMap;
  import org.hyperledger.indy.sdk.ErrorCode;
  @@ -73,7 +74,7 @@ public class InMemWallet implements CustomWallet {
  @Override
  public ErrorCode list(String keyPrefix, StringByReference resultString) {
  - JSONArray jArray = new JSONArray();
  + StringJoiner joiner = new StringJoiner(",", "[", "]");
  for (Iterator<Map.Entry<String, WalletRecord>> iterator = records.entrySet().iterator(); iterator.hasNext(); ) {
  @@ -84,13 +85,10 @@ public class InMemWallet implements CustomWallet {
  if (!key.startsWith(keyPrefix))
  continue;
  - JSONObject jObject = new JSONObject();
  - jObject.put(key, record.value);
  -
  - jArray.put(jObject);
  + joiner.add(record.value);
  }
  - resultString.setValue(jArray.toString());
  + resultString.setValue(joiner.toString());
  return ErrorCode.Success;
  }
  