docs(README): update crates.io badge

Author: seanmonstar

README.md

@@ -1,6 +1,6 @@
 # [hyper](https://hyper.rs)
 
-[![crates.io](https://meritbadge.herokuapp.com/hyper)](https://crates.io/crates/hyper)
+[![crates.io](https://img.shields.io/crates/v/hyper.svg)](https://crates.io/crates/hyper)
 [![Released API docs](https://docs.rs/hyper/badge.svg)](https://docs.rs/hyper)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
 [![CI](https://github.com/hyperium/hyper/workflows/CI/badge.svg)](https://github.com/hyperium/hyper/actions?query=workflow%3ACI)