Updated Maven Central logo

Author: SidneyAllen

README.md

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 # Xero-Java
 
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.xeroapi/xero-java/badge.png)](https://maven-badges.herokuapp.com/maven-central/com.github.xeroapi/xero-java)
+[![Maven Central](https://img.shields.io/maven-central/v/com.github.xeroapi/xero-java.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22com.github.xeroapi%22%20AND%20a:%22xero-java%22)
 
 This is the official Java SDK for Xero's API. It supports accounting, fixed asset and bank feed API endpoints. All third party libraries dependencies managed with Maven.