chore: update readme

README.md

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 > Across the Great Wall we can reach every corner in the world
 
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 [![License](https://img.shields.io/github/license/Anankke/SSPanel-Uim?style=flat-square)](https://github.com/Anankke/SSPanel-Uim/blob/dev/LICENSE)
 ![GitHub repo size](https://img.shields.io/github/repo-size/anankke/sspanel-uim?style=flat-square&color=328657)
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 [![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/O5O850UEH)
 
-<a href="https://www.vultr.com/?ref=8941355-8H">
-<img src="https://www.vultr.com/media/logo_onwhite.png" alt="Vultr" width="200" align="left" />
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+<a href="https://www.vultr.com/?ref=8941355-8H"><img src="https://www.vultr.com/media/logo_onwhite.svg" alt="Vultr" width="200" align="left" style="background-color:#2e3136"/></a>
 
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+<a href="https://www.digitalocean.com/?refcode=50f1a3b6244c&utm_campaign=Referral_Invite&utm_medium=Referral_Program&utm_source=badge"><img src="https://web-platforms.sfo2.cdn.digitaloceanspaces.com/WWW/Badge%201.svg" alt="DigitalOcean Referral Badge"  align="left" /></a>
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 ## 赞助商 / Sponsors