Update README.md

Author: avijit-nervana

README.md

@@ -84,7 +84,7 @@ The installation prerequisites are the same as described in the TensorFlow
 
         git clone https://github.com/NervanaSystems/ngraph-tf.git
         cd ngraph-tf
-        git checkout v0.11.0-rc0
+        git checkout v0.11.0
 
 
 2. Next run the following Python script to build TensorFlow, nGraph and the bridge. Please use Python 3.5:
@@ -183,9 +183,9 @@ run the following model:
 
 The build and installation instructions are idential for Ubuntu 16.04 and OS X. However, please
 note that the Python setup is not always the same across various Mac OS versions. TensorFlow build
-instructions recommend using homebrew and often people use pyenv. There is also Anaconda/Miniconda 
-which some users prefer. The basic criteria for building nGraph and the bridge on a Mac OS is 
-to ensure that TensorFlow is successfully built. 
+instructions recommend using Homebrew and often people use Pyenv. There is also Anaconda/Miniconda 
+which some users prefer. Ensure that you can build TenorFlow successfully on OS X with a suitable 
+Python environment prior to building nGraph.  
 
 ## Debugging