Do not add "x-amz-acl": "public-read" to the header when uploading artefacts to S3 bucket

[romanrev]

• Version: 18.3.0
• Electron-Updater: 2.0.0
• Target: OSX/Windows

We have to allow the s3:PutObjectAcl in the IAM policy for the electron-builder to be able to successfully upload the artefacts to the S3 bucket, since it always adds a header "x-amz-acl": "public-read" with each upload request - trying to mark every object it uploads to the bucket as publicly readable.
I suggest that this behaviour should be optional - and not the default one, since one can also achieve the same effect with appropriately crafted S3 bucket policy - which we actually prefer to.
Another use case is when an S3 bucket with the built artefacts should not be publicly accessible at all.

[develar]

and not the default one

Cannot agree because for most users it is what we should do. Because we cannot complicate documentation and ask to do some additional steps.

[romanrev]

well, please at least make an option to disable that behaviour, thank you

[develar]

19.16.0 — you can set acl to null to disable adding. Will be released today.

[develar]

@romanrev Released. Please check.

[romanrev]

thanks, much appreciated for your speedy resolution of the issue!