feat: support for Python 3.9

Author: heitorlessa

.github/workflows/python_build.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 39]
     env:
       OS: ${{ matrix.os }}
       PYTHON: ${{ matrix.python-version }}

pyproject.toml

@@ -1,7 +1,7 @@
 [tool.poetry]
 name = "aws_lambda_powertools"
 version = "1.19.0"
-description = "A suite of utilities for AWS Lambda functions to ease adopting best practices such as tracing, structured logging, custom metrics, and more."
+description = "A suite of utilities for AWS Lambda functions to ease adopting best practices such as tracing, structured logging, custom metrics, batching, idempotency, feature flags, and more."
 authors = ["Amazon Web Services"]
 include = ["aws_lambda_powertools/py.typed"]
 classifiers=[
@@ -12,6 +12,7 @@ classifiers=[
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
 ]
 repository="https://github.com/awslabs/aws-lambda-powertools-python"
 readme = "README.md"