Update README.md

Author: guiferpa

README.md

@@ -4,7 +4,7 @@
 [![GoDoc](https://godoc.org/github.com/guiferpa/gody?status.svg)](https://godoc.org/github.com/guiferpa/gody)
 [![Go Report Card](https://goreportcard.com/badge/github.com/guiferpa/gody)](https://goreportcard.com/report/github.com/guiferpa/gody)
 [![Build Status](https://cloud.drone.io/api/badges/guiferpa/gody/status.svg)](https://cloud.drone.io/guiferpa/gody)
-[![Coverage Status](https://coveralls.io/repos/github/guiferpa/gody/badge.svg?branch=master)](https://coveralls.io/github/guiferpa/gody?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/guiferpa/gody/badge.svg?branch=main)](https://coveralls.io/github/guiferpa/gody?branch=main)
 [![GitHub release (latest by date)](https://img.shields.io/github/v/release/guiferpa/gody?color=purple&label=latest)](https://github.com/guiferpa/gody/releases/latest)
 
 ### [Go versions supported](https://github.com/guiferpa/gody/blob/main/.github/workflows/pipeline.yml#L12)