Update Flight Cheapest Date Search example

Author: Anthony Roux

README.rst

@@ -203,7 +203,7 @@ List of supported endpoints
     amadeus.shopping.flight_destinations.get(origin='MAD')
 
     # Flight Cheapest Date Search
-    amadeus.shopping.flight_dates.get(origin='NYC', destination='MAD')
+    amadeus.shopping.flight_dates.get(origin='MAD', destination='MUC')
 
     # Flight Low-fare Search
     amadeus.shopping.flight_offers.get(origin='MAD', destination='NYC', departureDate='2019-08-01')