fix(GitChangelogGradlePlugin): Make tasks show up in "tasks"

Previously, tasks were lacking a group / description, so they would only
show up with `gradlew tasks --all`.

src/main/java/se/bjurr/gitchangelog/plugin/gradle/GitChangelogGradlePlugin.java

@@ -8,11 +8,16 @@ public class GitChangelogGradlePlugin implements Plugin<Project> {
   public void apply(final Project target) {
     target.getExtensions().create("gitChangelogPlugin", GitChangelogPluginExtension.class);
 
-    target.getTasks().register("gitChangelogSemanticVersion", GitChangelogSemanticVersionTask.class);
+    target.getTasks().register("gitChangelogSemanticVersion", GitChangelogSemanticVersionTask.class, task -> {
+      task.setDescription("Set version in gradle.properties from conventional commits.");
+      task.setGroup("Git Changelog");
+    });
 
-    target.getTasks().register("gitChangelog", GitChangelogTask.class, task ->
-        task.ignoreCommitsIfMessageMatches =
-            "^\\[maven-release-plugin\\].*|^\\[Gradle Release Plugin\\].*|^Merge.*|.*\\[GRADLE SCRIPT\\].*"
-    );
+    target.getTasks().register("gitChangelog", GitChangelogTask.class, task -> {
+      task.setDescription("Update CHANGELOG.md using conventional commits.");
+      task.setGroup("Git Changelog");
+      task.ignoreCommitsIfMessageMatches =
+          "^\\[maven-release-plugin\\].*|^\\[Gradle Release Plugin\\].*|^Merge.*|.*\\[GRADLE SCRIPT\\].*";
+    });
   }
 }