update branch name

Author: Roger-luo

README.md

@@ -3,7 +3,7 @@
 [![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://QuantumBFS.github.io/IBMQClient.jl/stable)
 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://QuantumBFS.github.io/IBMQClient.jl/dev)
 [![Build Status](https://github.com/QuantumBFS/IBMQClient.jl/workflows/CI/badge.svg)](https://github.com/QuantumBFS/IBMQClient.jl/actions)
-[![Coverage](https://codecov.io/gh/QuantumBFS/IBMQClient.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/QuantumBFS/IBMQClient.jl)
+[![Coverage](https://codecov.io/gh/QuantumBFS/IBMQClient.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/QuantumBFS/IBMQClient.jl)
 
 
 Julia Wrapper for the IBM Quantum Experience REST API. This API wrapper is based on

docs/src/index.md

@@ -1,7 +1,7 @@
 # IBMQClient
 
 [![Build Status](https://github.com/QuantumBFS/IBMQClient.jl/workflows/CI/badge.svg)](https://github.com/QuantumBFS/IBMQClient.jl/actions)
-[![Coverage](https://codecov.io/gh/QuantumBFS/IBMQClient.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/QuantumBFS/IBMQClient.jl)
+[![Coverage](https://codecov.io/gh/QuantumBFS/IBMQClient.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/QuantumBFS/IBMQClient.jl)
 
 
 Julia Wrapper for the IBM Quantum Experience REST API. This API wrapper is based on