Remove cargo-make badge

Author: flosse

README.md

@@ -1,7 +1,6 @@
 [![crates.io version](https://img.shields.io/crates/v/seed.svg)](https://crates.io/crates/seed)
 [![crates.io downloads](https://img.shields.io/crates/d/seed.svg)](https://crates.io/crates/seed)
 [![docs.rs](https://docs.rs/seed/badge.svg)](https://docs.rs/seed)
-[![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/81ed1acc77062ede3295683f21f2d39611843192/seed_branding/seed_logo.min.svg" width="256" title="Seed logo">