Implement ServerDisconnectEvent. Wow so many server switch events.

api/src/main/java/net/md_5/bungee/api/event/ServerDisconnectEvent.java

@@ -0,0 +1,29 @@
+package net.md_5.bungee.api.event;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import net.md_5.bungee.api.config.ServerInfo;
+import net.md_5.bungee.api.connection.ProxiedPlayer;
+import net.md_5.bungee.api.plugin.Event;
+
+@Data
+@AllArgsConstructor
+@ToString(callSuper = false)
+@EqualsAndHashCode(callSuper = false)
+public class ServerDisconnectEvent extends Event
+{
+
+    /**
+     * Player disconnecting from a server.
+     */
+    @NonNull
+    private final ProxiedPlayer player;
+    /**
+     * Server the player is disconnecting from.
+     */
+    @NonNull
+    private ServerInfo target;
+}