Update README.md

Author: apexdodge

README.md

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+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.api2pdf.client/api2pdf/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.api2pdf.client/api2pdf)
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 # api2pdf.java
 Java client for [Api2Pdf REST API](https://www.api2pdf.com/documentation)