Use getter instead of property

References #429

(cherry picked from commit 52588f2)

Author: acogoluegnes

src/main/java/com/rabbitmq/tools/jsonrpc/JsonRpcClient.java

@@ -237,7 +237,7 @@ public Object call(String[] args)
 
         Object[] actuals = new Object[arity];
         for (int count = 0; count < params.length; count++) {
-            actuals[count] = coerce(args[count + 1], params[count].type);
+            actuals[count] = coerce(args[count + 1], params[count].getType());
         }
 
         return call(method, actuals);