Updated to 1.17 and Java 16

eco-api/src/main/java/com/willfp/eco/core/Prerequisite.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core;
 
+import com.willfp.eco.core.proxy.ProxyConstants;
 import com.willfp.eco.util.ClassUtils;
 import lombok.Getter;
 import org.jetbrains.annotations.NotNull;
@@ -14,6 +15,7 @@ public class Prerequisite {
      * All existing prerequisites are registered on creation.
      */
     private static final List<Prerequisite> VALUES = new ArrayList<>();
+
     /**
      * Requires the server to be running an implementation of paper.
      */
@@ -22,6 +24,14 @@ public class Prerequisite {
             "Requires server to be running paper (or a fork)"
     );
 
+    /**
+     * Requires the server to be running 1.17
+     */
+    public static final Prerequisite v1_17 = new Prerequisite(
+            () -> ProxyConstants.NMS_VERSION.contains("17"),
+            "Requires server to be running 1.17+"
+    );
+
     /**
      * If the necessary prerequisite condition has been met.
      */