Add small note to config yml & corrected a check

src/main/java/me/libraryaddict/disguise/utilities/LibsPremium.java

@@ -11,6 +11,8 @@ import java.io.File;
 import java.io.IOException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
 
 /**
  * Created by libraryaddict on 2/06/2017.
@@ -194,7 +196,11 @@ public class LibsPremium {
 
             if (plugin.isPremium()) {
                 if (!isValidVersion(version, plugin.getVersion()) || plugin.getUserID() == null ||
-                        plugin.getDownloadID() == null) {
+                        plugin.getDownloadID() == null || plugin.getUserID().equals("666666") ||
+                        plugin.getParsedBuildDate().before(getPluginInformation().getParsedBuildDate()) ||
+                        plugin.getParsedBuildDate().after(new Date(
+                                getPluginInformation().getParsedBuildDate().getTime() +
+                                        TimeUnit.DAYS.toMillis(365 * 2)))) {
                     DisguiseUtilities.getLogger().warning(
                             "You have an old Lib's Disguises jar (" + file.getName() + " " + fileInfo +
                                     ") in the LibsDisguises folder! For security purposes, please replace this with a" +

src/main/java/me/libraryaddict/disguise/utilities/plugin/PluginInformation.java

@@ -2,6 +2,9 @@ package me.libraryaddict.disguise.utilities.plugin;
 
 import me.libraryaddict.disguise.utilities.LibsPremium;
 
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
 /**
  * Created by libraryaddict on 20/06/2019.
  */
@@ -53,6 +56,16 @@ public class PluginInformation {
         return buildDate;
     }
 
+    public Date getParsedBuildDate() {
+        try {
+            return new SimpleDateFormat("dd/MM/yyyy HH:mm").parse(getBuildDate());
+        }
+        catch (Exception ex) {
+        }
+
+        return null;
+    }
+
     public boolean isLegit() {
         return getUserID().matches("[0-9]+") && getResourceID().equals("32453") && getDownloadID().matches("-?[0-9]+");
     }