Update links and notices in README (#3142)

Author: nateprewitt

README.rst

@@ -2,15 +2,15 @@
 Boto3 - The AWS SDK for Python
 ===============================
 
-|Version| |Gitter|
+|Version| |Python| |License|
 
 Boto3 is the Amazon Web Services (AWS) Software Development Kit (SDK) for
 Python, which allows Python developers to write software that makes use
 of services like Amazon S3 and Amazon EC2. You can find the latest, most
 up to date, documentation at our `doc site`_, including a list of
 services that are supported.
 
-Boto3 is maintained and published by Amazon Web Services.
+Boto3 is maintained and published by `Amazon Web Services`_.
 
 Notices
 -------
@@ -20,18 +20,17 @@ on 07/15/2021. To avoid disruption, customers using Boto3 on Python 2.7 may
 need to upgrade their version of Python or pin the version of Boto3. For
 more information, see this `blog post <https://aws.amazon.com/blogs/developer/announcing-end-of-support-for-python-2-7-in-aws-sdk-for-python-and-aws-cli-v1/>`__.
 
+Starting in May 2022, we will be dropping support for Python 3.6. This follows the Python Software Foundation `end of support <https://www.python.org/dev/peps/pep-0494/#lifespan>`__ for the runtime which occurred on 2021-12-23.
 
 .. _boto: https://docs.pythonboto.org/
 .. _`doc site`: https://boto3.amazonaws.com/v1/documentation/api/latest/index.html
-.. |Gitter| image:: https://badges.gitter.im/boto/boto3.svg
-   :target: https://gitter.im/boto/boto3
-   :alt: Gitter
-.. |Downloads| image:: http://img.shields.io/pypi/dm/boto3.svg?style=flat
+.. _`Amazon Web Services`: https://aws.amazon.com/what-is-aws/
+.. |Python| image:: https://img.shields.io/pypi/pyversions/boto3.svg?style=flat
     :target: https://pypi.python.org/pypi/boto3/
-    :alt: Downloads
+    :alt: Python Versions
 .. |Version| image:: http://img.shields.io/pypi/v/boto3.svg?style=flat
     :target: https://pypi.python.org/pypi/boto3/
-    :alt: Version
+    :alt: Package Version
 .. |License| image:: http://img.shields.io/pypi/l/boto3.svg?style=flat
     :target: https://github.com/boto/boto3/blob/develop/LICENSE
     :alt: License
@@ -114,7 +113,6 @@ bandwidth to address them. Please use these community resources for getting
 help:
 
 * Ask a question on `Stack Overflow <https://stackoverflow.com/>`__ and tag it with `boto3 <https://stackoverflow.com/questions/tagged/boto3>`__
-* Come join the AWS Python community chat on `gitter <https://gitter.im/boto/boto3>`__
 * Open a support ticket with `AWS Support <https://console.aws.amazon.com/support/home#/>`__
 * If it turns out that you may have found a bug, please `open an issue <https://github.com/boto/boto3/issues/new>`__