Giving 1.15 servers more RAM due to vanilla WE

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/SubserverSystem.java

@@ -196,7 +196,7 @@ public class SubserverSystem {
         List<String> cmd = new LinkedList<>();
         cmd.add("java");
         cmd.add("-DlogPath=" + user.getId());
-        cmd.add("-Xmx384M");
+        cmd.add("-Xmx512M");
         cmd.addAll(JVM_ARGS);
         cmd.add("-jar");
         cmd.add(BINARY_PATH + "spigot-1.15.2.jar");