Fix multiple code quality issues

src/main/java/net/hypixel/modapi/error/UnknownErrorReason.java

@@ -12,6 +12,19 @@ public int getId() {
         return id;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        UnknownErrorReason that = (UnknownErrorReason) o;
+        return id == that.id;
+    }
+
+    @Override
+    public int hashCode() {
+        return id;
+    }
+
     @Override
     public String toString() {
         return "UnknownErrorReason{" +

src/main/java/net/hypixel/modapi/packet/impl/serverbound/ServerboundRegisterPacket.java

@@ -10,7 +10,7 @@
 import java.util.Set;
 
 /**
- * Notifys the remote server what versions of event packets we want to receive.
+ * Notifies the remote server what versions of event packets we want to receive.
  * <p>
  * You should not use this packet manually, instead, use {@link net.hypixel.modapi.HypixelModAPI#subscribeToEventPacket(Class)} to subscribe to event packets.
  */
@@ -27,7 +27,7 @@ public ServerboundRegisterPacket(PacketRegistry registry, Set<String> subscribed
         this.subscribedEvents = registry.getEventVersions(subscribedEventIdentifiers);
 
         if (subscribedEvents.size() > MAX_IDENTIFIERS) {
-            throw new IllegalArgumentException("wantedPackets cannot contain more than " + MAX_IDENTIFIERS + " identifiers");
+            throw new IllegalArgumentException("subscribedEvents cannot contain more than " + MAX_IDENTIFIERS + " identifiers");
         }
     }
 
@@ -41,7 +41,7 @@ protected boolean read(PacketSerializer serializer) {
 
         int size = serializer.readVarInt();
         if (size > MAX_IDENTIFIERS) {
-            throw new IllegalArgumentException("wantedPackets cannot contain more than " + MAX_IDENTIFIERS + " identifiers");
+            throw new IllegalArgumentException("subscribedEvents cannot contain more than " + MAX_IDENTIFIERS + " identifiers");
         }
 
         this.subscribedEvents = new HashMap<>(size);
@@ -70,7 +70,7 @@ public Map<String, Integer> getSubscribedEvents() {
     @Override
     public String toString() {
         return "ServerboundRegisterPacket{" +
-                "wantedPackets=" + subscribedEvents +
+                "subscribedEvents=" + subscribedEvents +
                 "} " + super.toString();
     }
 }