Fix Codecov badge.

Author: fabianfett

README.md

@@ -2,7 +2,7 @@
 
 [![Swift 5.1](https://img.shields.io/badge/Swift-5.1-blue.svg)](https://swift.org/download/)
 [![github-actions](https://github.com/fabianfett/swift-aws-lambda/workflows/CI/badge.svg)](https://github.com/fabianfett/swift-aws-lambda/actions)
-[![codecov](https://codecov.io/gh/fabianfett/swift-aws-lambda/branch/master/graph/badge.svg?token=ebzMRn2TqY)](https://codecov.io/gh/fabianfett/swift-aws-lambda)
+[![codecov](https://codecov.io/gh/fabianfett/swift-aws-lambda/branch/master/graph/badge.svg)](https://codecov.io/gh/fabianfett/swift-aws-lambda)
 ![lambdaOS](https://img.shields.io/badge/os-AWS--Lambda-green?style=flat)
 ![tuxOS](https://img.shields.io/badge/os-tuxOS-green.svg?style=flat)
 ![macOS](https://img.shields.io/badge/os-macOS-green.svg?style=flat)