Update README.md-small typo (#893)

could not find cdk-mint-cli in crates.io.  Found cdk-mint-rpc.

crates/cdk-mint-rpc/README.md

@@ -19,7 +19,7 @@ This crate includes:
 
 From crates.io:
 ```bash
-cargo install cdk-mint-cli
+cargo install cdk-mint-rpc
 ```
 
 As a library:
@@ -48,4 +48,4 @@ cdk-mint-cli keysets list
 
 ## License
 
-This project is licensed under the [MIT License](../../LICENSE).
+This project is licensed under the [MIT License](../../LICENSE).