chore: CHANGELOG and version bump for release 3.1.0 (#189)

Author: texastony

Diff for: CHANGELOG.rst

@@ -2,6 +2,25 @@
 Changelog
 *********
 
+3.1.0 -- 2021-11-10
+===================
+
+Deprecation
+-----------
+The AWS DynamoDB Encryption Client for Python no longer supports Python 3.5
+as of version 3.1; only Python 3.6+ is supported. Customers using
+Python 3.5 can still use the 2.x line of the AWS DynamoDB Encryption Client for Python,
+which will continue to receive security updates, in accordance
+with our `Support Policy <https://github.com/aws/aws-dynamodb-encryption-python/blob/master/SUPPORT_POLICY.rst>`__.
+
+Feature
+-----------
+* Warn on Deprecated Python usage
+  `#368 <https://github.com/aws/aws-encryption-sdk-python/pull/368>`_
+* Add Python 3.10 to CI
+* Remove Python 3.5 from testing
+
+
 3.0.0 -- 2021-07-15
 ===================
 

Diff for: src/dynamodb_encryption_sdk/identifiers.py

@@ -14,7 +14,7 @@
 from enum import Enum
 
 __all__ = ("LOGGER_NAME", "CryptoAction", "EncryptionKeyType", "KeyEncodingType")
-__version__ = "3.0.0"
+__version__ = "3.1.0"
 
 LOGGER_NAME = "dynamodb_encryption_sdk"
 USER_AGENT_SUFFIX = "DynamodbEncryptionSdkPython/{}".format(__version__)