show travis master status

Author: wing328

README.md

@@ -1,6 +1,6 @@
 # Swagger Code Generator
 
-[![Build Status](https://img.shields.io/travis/swagger-api/swagger-codegen.svg?label=Petstore%20Integration%20Test)](https://travis-ci.org/swagger-api/swagger-codegen)
+[![Build Status](https://img.shields.io/travis/swagger-api/swagger-codegen/master.svg?label=Petstore%20Integration%20Test)](https://travis-ci.org/swagger-api/swagger-codegen)
 [![Run Status](https://img.shields.io/shippable/5782588a3be4f4faa56c5bea.svg?label=Mustache%20Template%20Test)](https://app.shippable.com/projects/5782588a3be4f4faa56c5bea)
 [![Windows Test](https://ci.appveyor.com/api/projects/status/github/swagger-api/swagger-codegen?branch=master&svg=true&passingText=Windows%20Test%20-%20OK&failingText=Windows%20Test%20-%20Fails)](https://ci.appveyor.com/project/WilliamCheng/swagger-codegen-wh2wu)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.swagger/swagger-codegen-project/badge.svg?style=plastic)](https://maven-badges.herokuapp.com/maven-central/io.swagger/swagger-codegen-project)