[ImgBot] Optimize images

Created by: imgbot[bot]

Beep boop. Your images are optimized!

Your image file size has been reduced by 8% 🎉

Details

File	Before	After	Percent reduction
/images/apple-touch-icon-precomposed-152.png	14.29kb	12.20kb	14.60%
/meetup/07-shenzhen/shenzhen.jpg	846.47kb	773.38kb	8.63%
/meetup/08-shanghai/shanghai.jpg	738.12kb	687.95kb	6.80%
Total :	1,598.87kb	1,473.54kb	7.84%

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