add icon

README.md

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 # ts-commons
 
 [![License](http://img.shields.io/:license-MIT-brightgreen.svg)](https://github.com/wz2cool/ts-commons/blob/master/LICENSE)
-[![Build Status](https://github.com/wz2cool/ts-commons/actions/workflows/webpack.yml)](https://github.com/wz2cool/ts-commons/actions/workflows/webpack.yml/badge.svg)
+[![Build Status](https://github.com/wz2cool/ts-commons/actions/workflows/webpack.yml/badge.svg?branch=master)](https://github.com/wz2cool/ts-commons/actions/workflows/webpack.yml)
 [![Coverage Status](https://coveralls.io/repos/github/wz2cool/ts-commons/badge.svg?branch=master)](https://coveralls.io/github/wz2cool/ts-commons?branch=master)
 [![npm version](https://badge.fury.io/js/ts-commons.svg)](https://badge.fury.io/js/ts-commons)  
 common methods for typescript/javascript