Update README.md

README.md

 # minedu-OpenApi-PapyrosDrivers
 Client Drivers that can make calls to the Open Api of the Greek Ministry of Education
 
-An example of the api can be found on: https://papyros.modus.gr/openpapyros/swagger/
+An example of the api can be found on: https://protocoltest.minedu.gov.gr/openpapyros/swagger2/