Update README.md

Author: Wicpar

README.md

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 # Ktor OpenAPI Generator
 [![](https://jitpack.io/v/papsign/Ktor-OpenAPI-Generator.svg)](https://jitpack.io/#papsign/Ktor-OpenAPI-Generator)
-[![Build](https://github.com/papsign/Ktor-OpenAPI-Generator/workflows/Build/badge.svg?branch=master)](https://github.com/papsign/Ktor-OpenAPI-Generator/actions)
+[![Build](https://github.com/papsign/Ktor-OpenAPI-Generator/workflows/Build/badge.svg)](https://github.com/papsign/Ktor-OpenAPI-Generator/actions)
 
 The Ktor OpenAPI Generator is a library to automatically generate the descriptor as you route your ktor application.