Update readme with new api url

Fix validator with time queries for archiverappliance

src/main/java/ch/psi/daq/queryrest/controller/validator/QueryValidator.java

@@ -44,7 +44,7 @@ public class QueryValidator implements Validator {
       Request request = query.getRequest();
 
       if (DBMode.archiverappliance.equals(query.getDbMode())) {
-         if (!(request.getRequestRange() instanceof RequestRangeTime)) {
+         if (!request.getRequestRange().isTimeRangeDefined()) {
             errors.reject("dbMode", "ArchiverAppliance supports time range queries only!");
          }
       }