Fix readme typo (#23)

Author: 1egoman

README.md

@@ -40,7 +40,7 @@ where the build code bridges the dynamic library to node.js directly.
 3. `uniffi-bindgen-node` should be in `~/.cargo/bin` - make sure this is part of your `PATH`.
 
 ## Usage
-Run `uniffi-bindgen-node -- <lib_path>`, passing a dynamic library (`dylib`/`dll`/`so`) build to
+Run `uniffi-bindgen-node generate <lib_path>`, passing a dynamic library (`dylib`/`dll`/`so`) build to
 export a uniffi interface. See `output/` for the results. For more complicated scenarios, run
 `uniffi-bindgen-node --help`.