Fix broken link

Author: Pana

README.md

@@ -5,4 +5,4 @@ This workspace contains the 5 crates members of Ledger Device Rust SDK
 * [ledger_secure_sdk_sys](./ledger_secure_sdk_sys): bindings to [ledger_secure_sdk](https://github.com/LedgerHQ/ledger-secure-sdk)
 * [include_gif](./include_gif): procedural macro used to manage GIF
 * [testmacro](./testmacro): procedural macro used by unit and integrations tests
-* [cargo-ledger](./cargo_ledger): tool to build Ledger device applications developped in Rust
+* [cargo-ledger](./cargo-ledger): tool to build Ledger device applications developped in Rust