main branch badge fix

Author: kilmajster

README.md

@@ -2,7 +2,7 @@
     Ngrok Spring Boot Starter
     <br>
     <a href="https://travis-ci.org/kilmajster/ngrok-spring-boot-starter">
-        <img align="center" src="https://img.shields.io/travis/kilmajster/ngrok-spring-boot-starter/main.svg?logo=travis" alt="Travis build status badge">
+        <img align="center" src="https://img.shields.io/travis/kilmajster/ngrok-spring-boot-starter/master.svg?logo=travis&branch=main" alt="Travis build status badge">
     </a>
     <img align="center" src="https://img.shields.io/github/last-commit/kilmajster/ngrok-spring-boot-starter.svg" alt="Github last commit badge">
     <img align="center" src="https://img.shields.io/maven-central/v/io.github.kilmajster/ngrok-spring-boot-starter?color=1" alt="latest maven-central version badge">