update reamde

README.md

 # tensorpack
 Neural Network Toolbox based on TensorFlow
 
-In development. No document.
+In development. No document, don't use.
 
 ## Features:
 + Scoped abstraction of common models.
 + Provide callbacks to control training behavior (as in [Keras](http://keras.io)).
-+ Use `Dataflow` to own fine-grained control on data preprocessing.
++ Use `Dataflow` to gain fine-grained control on data preprocessing.
 + Automatically use the Queue operator in tensorflow to speed up input.
-+ Training and testing graph are modeled together, automatically.
++ Training and testing graph are modeled together, automatically. Just need to follow the conventions to setup stuffs.