E gradle release plugin defaults to release main-branch

Med workaround for researchgate/gradle-release#357

Author: Kjetil JD

build.gradle

@@ -18,7 +18,7 @@ plugins {
     id("java-library")
     id("maven-publish")
     id("org.jetbrains.kotlin.jvm") version "1.6.10"
-    id("net.researchgate.release") version "2.8.1"
+    id("net.researchgate.release") version "3.0.0"
     id("com.adarshr.test-logger") version "3.2.0"
     id("org.jetbrains.kotlin.plugin.spring") version "1.6.10"
     id("com.github.ben-manes.versions") version "0.42.0"
@@ -88,6 +88,9 @@ dependencies {
 release {
     newVersionCommitMessage = "[Release Plugin] - next version commit: "
     tagTemplate = "release-\${version}"
+    git {
+        requireBranch.set('master')
+    }
 }
 
 // https://help.github.com/en/actions/language-and-framework-guides/publishing-java-packages-with-gradle#publishing-packages-to-github-packages