Default to v4, this should be supported everywhere. Fixes issue amazon-archives#28

Author: peterkuiper

lambda/index.js

@@ -1,7 +1,9 @@
 'use strict';
 
 const AWS = require('aws-sdk');
-const S3 = new AWS.S3();
+const S3 = new AWS.S3({
+  signatureVersion: 'v4'
+});
 const Sharp = require('sharp');
 
 const BUCKET = process.env.BUCKET;