message: no hyphen for "open source"
diff: ------------------- |
  [![Documentation](https://img.shields.io/badge/api-reference-blue.svg)](https://www.tensorflow.org/api_docs/) |
  -[TensorFlow](https://www.tensorflow.org/) is an end-to-end open-source platform
  +[TensorFlow](https://www.tensorflow.org/) is an end-to-end open source platform
  for machine learning. It has a comprehensive, flexible ecosystem of
  [tools](https://www.tensorflow.org/resources/tools),
  [libraries](https://www.tensorflow.org/resources/libraries-extensions), and
  