Merge pull request vnpy#3459 from vnpy/dev

Dev

Merge pull request vnpy#3396 from vnpy/dev

[Mod] update badages in readme.md

Merge pull request vnpy#3374 from vnpy/dev

3.5.0 release

Merge pull request vnpy#3361 from vnpy/dev

[Mod] update CHANGELOG.md

Merge pull request vnpy#3329 from vnpy/dev

3.2.0发布合并

Merge pull request vnpy#3309 from vnpy/dev

[Mod] set numpy version to 1.21.5 to ensure Python 3.7 compatability

Merge pull request vnpy#3298 from vnpy/dev

[Mod] update setup.cfg

Merge pull request vnpy#3258 from vnpy/dev

Dev

Merge pull request vnpy#3221 from vnpy/dev

2.9.0版本发布