message: Update tf-learn reference to TF Estimators
diff: @@ -28,7 +28,7 @@ models:
  * Easy access through session wrappers
  * Easy integration with common high-level APIs, such as
  - [tf-learn](https://www.tensorflow.org/get_started/tflearn) and
  + [TensorFlow Estimators](https://www.tensorflow.org/programmers_guide/estimators) and
  [Keras](https://keras.io/)
  * Inspection of runtime tensor values and node connections
  * Conditional breaking after runs that generate tensors satisfying given
  