Auhentication warning during s3 sync

[Deraen]

Mar 14, 2018 5:59:39 PM com.amazonaws.services.s3.internal.S3V4AuthErrorRetryStrategy buildRetryParams
WARNING: Attempting to re-send the request to testi-metosin-fi-sitebucket-1vvyctvha8ad5.s3.eu-central-1.amazonaws.com with AWS V4 authentication. To avoid this warning in the future, please use region-specific endpoint to access buckets located in regions that require V4 signing.
 - [update] blog/schema-spec-web-devs/index.html

[martinklepsch]

This probably needs changes done here: https://github.com/confetti-clj/s3-deploy

Not sure whats required though and might not have time in next week or two so PRs welcome :)