[ImgBot] optimizes images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 43% 🎉

Details

File	Before	After	Percent reduction
/vignettes/figures/proxysnps/plot_r2-1.png	30.11kb	11.78kb	60.88%
/rs42.png	13.42kb	12.87kb	4.10%
Total :	43.53kb	24.65kb	43.37%

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