(docs) badges' links

README.md

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 # PCRE4J: PCRE for Java
 
-![GitHub License](https://img.shields.io/github/license/alexey-pelykh/pcre4j)
-![GitHub branch check runs](https://img.shields.io/github/check-runs/alexey-pelykh/pcre4j/main)
+[![License](https://img.shields.io/github/license/alexey-pelykh/pcre4j)](https://www.gnu.org/licenses/lgpl-3.0.txt)
+[![CI](https://img.shields.io/github/check-runs/alexey-pelykh/pcre4j/main)](https://github.com/alexey-pelykh/pcre4j/actions/workflows/ci.yaml)
 [![codecov](https://codecov.io/gh/alexey-pelykh/pcre4j/graph/badge.svg?token=7UJZ501GWT)](https://codecov.io/gh/alexey-pelykh/pcre4j)
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+[![Maven Central Version](https://img.shields.io/maven-central/v/org.pcre4j/lib)](https://mvnrepository.com/artifact/org.pcre4j/lib)
 [![javadoc](https://javadoc.io/badge2/org.pcre4j/lib/javadoc.svg)](https://javadoc.io/doc/org.pcre4j)
 
 The PCRE4J project's goal is to bring the power of the [PCRE](https://www.pcre.org) library to Java.