add info about supported TF versions

Author: illagrenan

README.rst

@@ -30,6 +30,22 @@ Supported Python versions are: ``3.5`` and ``3.6``.
     pip install --upgrade tensorflow-serving-api-python3
 
 
+Supported versions of Tensorflow
+--------------------------------
+
++-----------------------+------------------------------------------------+--------------------------------------------------------+
+| Tensorflow version    | Serving API version                            | Link to original serving package                       |
++-----------------------+------------------------------------------------+--------------------------------------------------------+
+| ``tensorflow~=1.4.0`` | ``pip install tensorflow-serving-api-python3~=1.4.0`` | https://pypi.org/project/tensorflow-serving-api/1.4.0/ |
++-----------------------+------------------------------------------------+--------------------------------------------------------+
+| ``tensorflow~=1.5.0`` | TBA                                            | https://pypi.org/project/tensorflow-serving-api/1.5.0/ |
++-----------------------+------------------------------------------------+--------------------------------------------------------+
+| ``tensorflow~=1.6.0`` | TBA                                            | https://pypi.org/project/tensorflow-serving-api/1.6.0/ |
++-----------------------+------------------------------------------------+--------------------------------------------------------+
+| ``tensorflow~=1.7.0`` | TBA                                            | https://pypi.org/project/tensorflow-serving-api/1.7.0/ |
++-----------------------+------------------------------------------------+--------------------------------------------------------+
+
+
 Why?
 ----