Fix sponge8 compile

Author: lucko

spark-sponge8/src/main/java/me/lucko/spark/sponge/Sponge8PlatformInfo.java

@@ -44,7 +44,7 @@ public String getName() {
 
     @Override
     public String getVersion() {
-        return this.game.platform().container(Platform.Component.IMPLEMENTATION).metadata().version();
+        return this.game.platform().container(Platform.Component.IMPLEMENTATION).metadata().version().toString();
     }
 
     @Override

spark-sponge8/src/main/java/me/lucko/spark/sponge/Sponge8SparkPlugin.java

@@ -46,7 +46,7 @@
 import org.spongepowered.api.event.lifecycle.StartedEngineEvent;
 import org.spongepowered.api.event.lifecycle.StoppingEngineEvent;
 import org.spongepowered.plugin.PluginContainer;
-import org.spongepowered.plugin.jvm.Plugin;
+import org.spongepowered.plugin.builtin.jvm.Plugin;
 
 import java.nio.file.Path;
 import java.util.List;
@@ -93,7 +93,7 @@ public void onDisable(StoppingEngineEvent<Server> event) {
 
     @Override
     public String getVersion() {
-        return this.pluginContainer.metadata().version();
+        return this.pluginContainer.metadata().version().toString();
     }
 
     @Override