Update README.md

Author: MBenincasa

README.md

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 [![Maven Central](https://img.shields.io/maven-central/v/io.github.mbenincasa/java-excel-utils.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22io.github.mbenincasa%22%20AND%20a:%22java-excel-utils%22)
+[![GitHub release](https://img.shields.io/github/release/MBenincasa/java-excel-utils)](https://github.com/MBenincasa/java-excel-utils/releases/)
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 # Java Excel Utils
 
 Java Excel Utils is still an embryonic project. This open source library will collect different tools to speed up the work with Excel files.