1.13

What's Changed

• add bucket lock. by @Robothy in #71
• close channel if needed. by @Robothy in #74
• add ETag if not null. by @Robothy in #75
• shutdown event executors orderly by @Robothy in #76
• create LocalS3Router and remove spring-web by @Robothy in #78

Full Changelog: 1.12...1.13