Replace deprecated header function

bukkit/Metrics.java

@@ -9,9 +9,11 @@
 import java.lang.reflect.Method;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
@@ -28,6 +30,7 @@
 import java.util.zip.GZIPOutputStream;
 import javax.net.ssl.HttpsURLConnection;
 import org.bukkit.Bukkit;
+import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.Plugin;
@@ -51,22 +54,23 @@ public Metrics(JavaPlugin plugin, int serviceId) {
     // Get the config file
     File bStatsFolder = new File(plugin.getDataFolder().getParentFile(), "bStats");
     File configFile = new File(bStatsFolder, "config.yml");
-    YamlConfiguration config = YamlConfiguration.loadConfiguration(configFile);
+    FileConfiguration config = YamlConfiguration.loadConfiguration(configFile);
     if (!config.isSet("serverUuid")) {
       config.addDefault("enabled", true);
       config.addDefault("serverUuid", UUID.randomUUID().toString());
       config.addDefault("logFailedRequests", false);
       config.addDefault("logSentData", false);
       config.addDefault("logResponseStatusText", false);
       // Inform the server owners about bStats
+      List<String> header = new ArrayList<String>();
+      header.add("bStats (https://bStats.org) collects some basic information for plugin authors, like how");
+      header.add("many people use their plugin and their total player count. It's recommended to keep bStats");
+      header.add("enabled, but if you're not comfortable with this, you can turn this setting off. There is no");
+      header.add("performance penalty associated with having metrics enabled, and data sent to bStats is fully");
+      header.add("anonymous.");
       config
           .options()
-          .header(
-              "bStats (https://bStats.org) collects some basic information for plugin authors, like how\n"
-                  + "many people use their plugin and their total player count. It's recommended to keep bStats\n"
-                  + "enabled, but if you're not comfortable with this, you can turn this setting off. There is no\n"
-                  + "performance penalty associated with having metrics enabled, and data sent to bStats is fully\n"
-                  + "anonymous.")
+          .setHeader(header)
           .copyDefaults(true);
       try {
         config.save(configFile);