Close s3client to avoid memory leak

Author: Tianlu Shi

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>software.amazon.sns</groupId>
     <artifactId>sns-extended-client</artifactId>
-    <version>2.0.0</version>
+    <version>2.0.1</version>
     <packaging>jar</packaging>
     <name>Amazon SNS Extended Client Library for Java</name>
     <description>An extension to the Amazon SNS client that enables sending messages up to 2GB via Amazon S3.

src/main/java/software/amazon/sns/AmazonSNSExtendedClient.java

@@ -275,4 +275,10 @@ private PublishRequest copyPublishRequest(PublishRequest publishRequest) {
         publishRequestBuilder.messageAttributes(attributes);
         return publishRequestBuilder.build();
     }
+
+    @Override
+    public void close() {
+        super.close();
+        this.snsExtendedClientConfiguration.getS3Client().close();
+    }
 }