chore: fix crates badge

Author: dr-orlovsky

README.md

@@ -5,7 +5,7 @@
 ![Lints](https://github.com/rust-amplify/amplify-num/workflows/Lints/badge.svg)
 [![codecov](https://codecov.io/gh/rust-amplify/amplify-num/branch/master/graph/badge.svg)](https://codecov.io/gh/rust-amplify/amplify-num)
 
-[![crates.io](https://meritbadge.herokuapp.com/amplify_num)](https://crates.io/crates/amplify_num)
+[![crates.io](https://img.shields.io/crates/v/amplify_num.svg)](https://crates.io/crates/amplify_num)
 [![Docs](https://docs.rs/amplify_num/badge.svg)](https://docs.rs/amplify_num)
 [![unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg)](https://github.com/rust-secure-code/safety-dance/)
 [![Apache-2 licensed](https://img.shields.io/crates/l/amplify_num)](./LICENSE)