fix(readme): Fix the package name in installation part

Change the `maestro` to `maestro-rust-sdk` for the rust analyzer  to recognize the package.

p.s. The package name can alternatively be changed for the sake of simplicity.

README.md

@@ -48,7 +48,7 @@
 
 ```toml
 [dependencies]
-maestro = { git = "https://github.com/maestro-org/rust-sdk.git" }
+maestro-rust-sdk = { git = "https://github.com/maestro-org/rust-sdk.git" }
 ```
 
 ```rust