Clarify in the docs that NAPALM 3 is Python 3.6+ only (#1222)

README.md

@@ -1,4 +1,5 @@
 [![PyPI](https://img.shields.io/pypi/v/napalm.svg)](https://pypi.python.org/pypi/napalm)
+[![PyPI versions](https://img.shields.io/pypi/pyversions/napalm.svg)](https://pypi.python.org/pypi/napalm)
 [![Build Status](https://travis-ci.org/napalm-automation/napalm.svg?branch=master)](https://travis-ci.org/napalm-automation/napalm)
 [![Coverage Status](https://coveralls.io/repos/github/napalm-automation/napalm/badge.svg)](https://coveralls.io/github/napalm-automation/napalm)
 [![Code Style](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
@@ -31,6 +32,9 @@ Install
 pip install napalm
 ```
 
+*Note*: Beginning with release 3.0.0 and later, NAPALM offers support for
+Python 3.6+ only.
+
 
 Upgrading
 =========

docs/installation/index.rst

@@ -1,17 +1,21 @@
 Installation
 ============
 
-
 Full installation
 -----------------
 
 You can install napalm with pip:
 
 .. code-block:: bash
-    
+
     pip install napalm
 
-That will install all the drivers currently available.
+That will install all the core drivers currently available.
+
+.. note::
+
+    Beginning with release 3.0.0 and later, NAPALM offers support for Python
+    3.6+ only.
 
 
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