[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced!

Details

| File | Before | After | Percent reduction | |:--|:--|:--|:--| | /docs/assets/2020/seminar-01/seminar-2020-01-group-photo.jpg | 418.88kb | 398.58kb | 4.85% | | /docs/assets/2020/seminar-01/seminar-2020-01-after-party.jpg | 425.83kb | 406.49kb | 4.54% | | /docs/assets/2020/seminar-01/seminar-2020-01-chairman-appointment.jpg | 422.32kb | 404.13kb | 4.31% | | /docs/assets/2020/seminar-01/seminar-2020-01-talk-caoyazheng.jpg | 256.56kb | 253.67kb | 1.13% | | | | | | | **Total :** | **1,523.58kb** | **1,462.87kb** | **3.99%** |

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[claassistantio]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[huan]

test

[huan]

test2