Update executable name in README.md

Author: kornilova203

README.md

@@ -35,7 +35,7 @@ docker-compose build ubuntu-18.04-llvm-6.0
 # Build the bindgen tool and run the tests.
 docker-compose run --rm ubuntu-18.04-llvm-6.0
 # Run the bindgen tool inside the container.
-docker-compose run --rm ubuntu-18.04-llvm-6.0 target/scalaBindgen -name union tests/samples/Union.h --
+docker-compose run --rm ubuntu-18.04-llvm-6.0 target/scala-native-bindgen -name union tests/samples/Union.h --
 ```
 
  [CMake]: https://cmake.org/