S3Proxy 2.6.0

• Change Docker storage backend to filesystem-nio2
• Fix insecure path traversal in filesystem and filesystem-nio2, #769
• Ignore new AWS checksum headers, #765
• Run s3-tests against Minio in CI, #744
• Support IRSA for aws-s3 provider, #749
• Support JSON logging, #764
• Upgrade to Apache jclouds 2.7.0, #468, #708, #746

Thanks @Anhui-tqhuang and @ryanfaircloth for opening pull requests to improve S3Proxy!
Also thanks @nicowaisman for privately reporting a security vulnerability.