Bump version to v3.9.0 (#2068)

Bump version to v3.8.0 (#2045)

Co-authored-by: Ubuntu <azureuser@fredVm.vhy1gkxcwjeupabp5bzcpks1re.bx.internal.cloudapp.net>

Bump version to v3.7.0 (#2027)

Bump version to v3.6.0 (#1986)

* Bump version to v3.6.0

* Update CHANGELOG.md

Bump vesion to v3.5.0 (#1968)

* Bump vesion to v3.5.0

* update CHANGELOG.md

* update CHANGELOG.md

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Co-authored-by: xuzhang3 <[email protected]>

Bump version to v3.4.0 (#1950)

* Bump version to v3.4.0

* Update CHANGELOG.md

* update documentation

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Co-authored-by: xuzhang3 <[email protected]>

fix compatible with py3.6 (#1854)

https://docs.python.org/3/library/__future__.html#module-contents

Bump version to v3.3.0 (#1841)

* Bump version to v3.3.0

* Add new commit PR

* update document

* add #1844

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Co-authored-by: xu <[email protected]>

Bump version to v3.2.0 (#1818)

* Bump version to v3.2.0

* update CHANGELOG.md v3.2.0

* update CHANGELOG.md v3.2.0

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Co-authored-by: xu <[email protected]>

Bump version to v3.0.1 (#1772)

* Bump version to v3.0.1

* update CHANGELOG.md

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Co-authored-by: xu <[email protected]>