fix ssl default

[j-tr]

Closes #327

The boto3 client parameter use_ssl defaults to True. Setting it to None here contradicts the default and causes uploads to SSL-only buckets to fail.
Allowing SSL only on S3 is AWS best practice https://docs.aws.amazon.com/AmazonS3/latest/userguide/security-best-practices.html and therefore, this should work without the need to explicitly set use_ssl to true in the client parameters.

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[j-tr]

@desertaxle would it be possible to get some feedback on this?