Add a polite notice if you don't have ProtocolLib

src/main/java/eu/m724/tweaks/TweaksPlugin.java

@@ -34,6 +34,13 @@ public class TweaksPlugin extends MStatsPlugin {
     public void onEnable() {
         long start = System.nanoTime();
 
+        if (getServer().getPluginManager().getPlugin("ProtocolLib") == null) {
+            getLogger().severe("ProtocolLib is required for this plugin.");
+            getLogger().severe("https://www.spigotmc.org/resources/protocollib.1997/");
+            getServer().getPluginManager().disablePlugin(this);
+            return;
+        }
+
         TweaksConfig config = TweaksConfig.load(this);
         new Language(Locale.US); // TODO
 

src/main/resources/plugin.yml

@@ -5,7 +5,7 @@ website: https://www.spigotmc.org/resources/tweaks724.121057/
 
 main: eu.m724.tweaks.TweaksPlugin
 api-version: 1.21.1
-depend: [ProtocolLib]
+softdepend: [ProtocolLib]
 
 libraries:
   - eu.m724:mstats-spigot:0.1.0