Update base URL to use v2 endpoints

Author: ConnorLinfoot

hypixel-api-core/src/main/java/net/hypixel/api/HypixelAPI.java

@@ -21,7 +21,7 @@
 import java.util.concurrent.CompletableFuture;
 
 public class HypixelAPI {
-    static final String BASE_URL = "https://api.hypixel.net/";
+    static final String BASE_URL = "https://api.hypixel.net/v2/";
 
     private final HypixelHttpClient httpClient;