Update README.md

Author: ssung88

README.md

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 # Square Java SDK
 
-[![Travis status](https://travis-ci.org/square/square-java-sdk.svg?branch=master)](https://travis-ci.org/square/square-java-sdk)
+[![Travis status](https://travis-ci.com/square/square-java-sdk.svg?branch=master)](https://travis-ci.com/square/square-java-sdk)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.squareup/square/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.squareup/square)
 [![Apache-2 license](https://img.shields.io/badge/license-Apache2-brightgreen.svg)](https://www.apache.org/licenses/LICENSE-2.0)