fixes #95 remove used imports

Author: stevehu

src/main/java/com/networknt/aws/lambda/handler/middleware/proxy/LambdaProxyMiddleware.java

@@ -1,7 +1,5 @@
 package com.networknt.aws.lambda.handler.middleware.proxy;
 
-import software.amazon.awssdk.core.retry.RetryPolicy;
-import software.amazon.awssdk.core.retry.conditions.RetryCondition;
 import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;
 import com.networknt.aws.lambda.LightLambdaExchange;
 import com.networknt.aws.lambda.handler.Handler;