Make getLastOperation method public

Author: theghost5800

cloudfoundry-client/src/main/java/org/cloudfoundry/client/v3/servicebindings/ServiceBinding.java

@@ -45,7 +45,7 @@ public abstract class ServiceBinding extends Resource {
      */
     @JsonProperty("last_operation")
     @Nullable
-    abstract LastOperation getLastOperation();
+    public abstract LastOperation getLastOperation();
 
     /**
      * The relationships