chore: add Python 3.8 in badge as it's supported

Author: heitorlessa

README.md

@@ -1,6 +1,6 @@
 # Lambda Powertools
 
-![PackageStatus](https://img.shields.io/static/v1?label=status&message=beta&color=blueviolet?style=flat-square) ![PythonSupport](https://img.shields.io/static/v1?label=python&message=3.6%20|%203.7&color=blue?style=flat-square&logo=python)
+![PackageStatus](https://img.shields.io/static/v1?label=status&message=beta&color=blueviolet?style=flat-square) ![PythonSupport](https://img.shields.io/static/v1?label=python&message=3.6%20|%203.7|%203.8&color=blue?style=flat-square&logo=python)
 
 A suite of utilities for AWS Lambda Functions that makes tracing with AWS X-Ray, structured logging and creating custom metrics asynchronously easier - Currently available for Python only and compatible with Python >=3.6.
 

python/README.md

@@ -1,6 +1,6 @@
 # Lambda Powertools
 
-![PackageStatus](https://img.shields.io/static/v1?label=status&message=beta&color=blueviolet?style=flat-square) ![PythonSupport](https://img.shields.io/static/v1?label=python&message=3.6%20|%203.7&color=blue?style=flat-square&logo=python)
+![PackageStatus](https://img.shields.io/static/v1?label=status&message=beta&color=blueviolet?style=flat-square) ![PythonSupport](https://img.shields.io/static/v1?label=python&message=3.6%20|%203.7|%203.8&color=blue?style=flat-square&logo=python)
 
 A suite of utilities for AWS Lambda Functions that makes tracing with AWS X-Ray, structured logging and creating custom metrics asynchronously easier - Currently available for Python only and compatible with Python >=3.6.