Remove CircleCI Badge from README

Author: nhinsch

README.md

@@ -1,5 +1,4 @@
 # datadog-lambda-extension
-[![CircleCI](https://circleci.com/gh/DataDog/datadog-agent/tree/master.svg?style=svg&circle-token=dbcee3f02b9c3fe5f142bfc5ecb735fdec34b643)](https://circleci.com/gh/DataDog/datadog-agent/tree/master)
 [![Slack](https://chat.datadoghq.com/badge.svg?bg=632CA6)](https://chat.datadoghq.com/)
 [![License](https://img.shields.io/badge/license-Apache--2.0-blue)](https://github.com/DataDog/datadog-agent/blob/master/LICENSE)
 
@@ -63,4 +62,4 @@ For product feedback and questions, join the `#serverless` channel in the [Datad
 
 Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0.
 
-This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2021 Datadog, Inc.
+This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2021 Datadog, Inc.