Fixes Regex to match outputted url that was tested to work.

aws-sdk-resources/spec/services/s3/object/presigned_url_spec.rb

@@ -31,7 +31,7 @@ module S3
           })
 
           url = obj.presigned_url(:get, virtual_host: true)
-          expect(url).to match(/^http:\/\/my.bucket.com\//)
+          expect(url).to match(/^http:\/\/my\.bucket\.com(:80)?\//)
         end
 
         it 'rejects empty keys' do