Dropping 3.4 as well

Author: farleyb-amazon

CHANGELOG.rst

@@ -10,7 +10,9 @@ Deprecation Announcement
 The AWS Encryption SDK for Python is discontinuing support for Python 2. Future major versions of this library
 will drop support for Python 2 and begin to adopt changes that are known to break Python 2.
 
-Security updates will still be available for the 2.x line for the next 12 months, in accordance with our `Support Policy <https://github.com/aws/aws-encryption-sdk-python/blob/master/SUPPORT_POLICY.rst>`__.
+Support for Python 3.4 will be removed at the same time. Moving forward, we will support Python 3.5+.
+
+Security updates will still be available for the Encryption SDK 2.x line for the next 12 months, in accordance with our `Support Policy <https://github.com/aws/aws-encryption-sdk-python/blob/master/SUPPORT_POLICY.rst>`__.
 
 
 2.3.0 -- 2021-06-16

README.rst

@@ -38,7 +38,8 @@ Required Prerequisites
 
   **NOTE: 2.x is the last major version of this library that will
   support Python 2. Future major versions will begin to adopt changes
-  known to break Python 2.**
+  known to break Python 2. Python 3.4 support will also be removed
+  in future major versions.**
 * cryptography >= 2.5.0
 * boto3 >= 1.10.0
 * attrs