Update README.md (#5)

update coverage badge to main

Author: Inbaraj-S

README.md

@@ -5,7 +5,7 @@ on the existing OCI load balancer features to act as an ingress controller for c
 [![Go Report Card](https://goreportcard.com/badge/github.com/oracle/oci-native-ingress-controller)](https://goreportcard.com/report/github.com/oracle/oci-native-ingress-controller)
 [![License](http://img.shields.io/badge/license-UPL%201.0-blue.svg)](https://oss.oracle.com/licenses/upl/)
 [![Release](https://img.shields.io/github/v/release/oracle/oci-native-ingress-controller)](https://img.shields.io/github/v/release/oracle/oci-native-ingress-controller)
-[![Coverage Status](https://coveralls.io/repos/github/oracle/oci-native-ingress-controller/badge.svg?branch=master)](https://coveralls.io/github/oracle/oci-native-ingress-controller?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/oracle/oci-native-ingress-controller/badge.svg?branch=main)](https://coveralls.io/github/oracle/oci-native-ingress-controller?branch=main)
 
 ## Getting Started
 Please have a look at [Getting Started](./GettingStarted.md)
@@ -29,4 +29,4 @@ vulnerability disclosure process.
 ## License
 
 Copyright (c) 2023 Oracle and/or its affiliates.
-Released under the Universal Permissive License v1.0 as shown at <https://oss.oracle.com/licenses/upl/>.
+Released under the Universal Permissive License v1.0 as shown at <https://oss.oracle.com/licenses/upl/>.