message: Add missing dependencies download command
diff: @@ -8,6 +8,7 @@ Python without requiring the rest of TensorFlow.
  To build a binary wheel run this script:
  ```
  sudo apt install swig libjpeg-dev zlib1g-dev python3-dev python3-numpy
  +sh tensorflow/lite/tools/make/download_dependencies.sh
  sh tensorflow/lite/tools/pip_package/build_pip_package.sh
  ```
  That will print out some output and a .whl file. You can then install that
  