@Override
    protected AWSFreeTierAsync build(AwsAsyncClientParams params) {
        return new AWSFreeTierAsyncClient(params);
    }
Construct an asynchronous implementation of AWSFreeTierAsync using the current builder configuration.

@param params
       Current builder configuration represented as a parameter object.
@return Fully configured implementation of AWSFreeTierAsync.
aws-java-sdk-freetier/src/main/java/com/amazonaws/services/freetier/AWSFreeTierAsyncClientBuilder.java