version to 8.9.2

callback body support 'null' (#518)

Co-authored-by: YangSen-qn <yangsen@qiniu.com>

Resume Upload default version to v2 (#517)

* resume default version to v2

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Co-authored-by: YangSen-qn <yangsen@qiniu.com>

up log max record size to 4MB (#513)

Add Doc (#510)

version to 8.6.0 (#504)

Merge pull request #498 from YangSen-qn/develop

connect config support get from server

Merge pull request #494 from YangSen-qn/multi-region

change CHANGELOG.md

Merge pull request #485 from YangSen-qn/develop

add ap-northeast-1

Update CHANGELOG.md