Fix link to plugin portal

Author: jjohannes

README.md

@@ -1,7 +1,7 @@
 # Extra Java Module Info Gradle plugin
 
 [![Build Status](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2Fgradlex-org%2Fextra-java-module-info%2Fbadge%3Fref%3Dmain&style=flat)](https://actions-badge.atrox.dev/gradlex-org/extra-java-module-info/goto?ref=main)
-[![Gradle Plugin Portal](https://img.shields.io/maven-metadata/v?label=Plugin%20Portal&metadataUrl=https%3A%2F%2Fplugins.gradle.org%2Fm2%2Forg%2Fgradlex%extra-java-module-info%2Forg.gradlex.extra-java-module-info%2Fmaven-metadata.xml)](https://plugins.gradle.org/plugin/org.gradlex.extra-java-module-info)
+[![Gradle Plugin Portal](https://img.shields.io/maven-metadata/v?label=Plugin%20Portal&metadataUrl=https%3A%2F%2Fplugins.gradle.org%2Fm2%2Forg%2Fgradlex%2Fextra-java-module-info%2Forg.gradlex.extra-java-module-info.gradle.plugin%2Fmaven-metadata.xml)](https://plugins.gradle.org/plugin/org.gradlex.extra-java-module-info)
 
 A Gradle 6.4+ plugin to use legacy Java libraries as _Java Modules_ in a modular Java project.