Fixed the broken link to TensorFlow installation guide in README (aymericdamien#193)

Author: JasonVann

README.md

@@ -78,7 +78,7 @@ or (if you want GPU support):
 pip install tensorflow_gpu
 ```
 
-For more details about TensorFlow installation, you can check [TensorFlow Installation Guide](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/g3doc/get_started/os_setup.md)
+For more details about TensorFlow installation, you can check [TensorFlow Installation Guide](https://www.tensorflow.org/install/)
 
 ## More Examples
 The following examples are coming from [TFLearn](https://github.com/tflearn/tflearn), a library that provides a simplified interface for TensorFlow. You can have a look, there are many [examples](https://github.com/tflearn/tflearn/tree/master/examples) and [pre-built operations and layers](http://tflearn.org/doc_index/#api).