Use commit sha instead of 'master' as url logo (permalink)
[![Built with cargo-make](https://sagiegurari.github.io/cargo-make/assets/badges/cargo-make.svg)](https://sagiegurari.github.io/cargo-make)
<p align="center">
- <img src="https://raw.githubusercontent.com/seed-rs/seed-rs.org/master/seed_branding/seed_logo.min.svg" width="256" title="Seed logo">
+ <img src="https://raw.githubusercontent.com/seed-rs/seed-rs.org/81ed1acc77062ede3295683f21f2d39611843192/seed_branding/seed_logo.min.svg" width="256" title="Seed logo">
</p>
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