Updates based on latest Ionic release

deploy.sh

 npm install
 
 # build ios
-ionic build ios --prod
+ionic cordova build ios --prod
 # Run on ios
-ionic run ios --device
+ionic cordova run ios 
 
 # If the above command fails with the following error:
 # xcrun: error: unable to find utility "PackageApplication", not a developer tool or in PATH

server/src/main/java/com/example/beer/BeerController.java

 import org.springframework.web.bind.annotation.RestController;
 
 import java.util.Collection;
-import java.util.HashMap;
-import java.util.Map;
 import java.util.stream.Collectors;
 
 @RestController