message: Update README.md
  Fix sentence structure
diff: @@ -65,7 +65,7 @@ guidelines](CONTRIBUTING.md). This project adheres to TensorFlow's
  uphold this code.**
  **We use [GitHub issues](https://github.com/tensorflow/tensorflow/issues) for
  -tracking requests and bugs. So please see
  +tracking requests and bugs, so please see
  [TensorFlow Discuss](https://groups.google.com/a/tensorflow.org/forum/#!forum/discuss) for general questions
  and discussion, and please direct specific questions to [Stack Overflow](https://stackoverflow.com/questions/tagged/tensorflow).**
  