Revert "Revert "Oh yes b1g reducer just for the sake of it""

This reverts commit fc04fdc.

Author: jamezrin

balancer/src/main/java/com/jaimemartz/playerbalancer/listeners/PluginMessageListener.java

@@ -158,8 +158,10 @@ public void onPluginMessage(PluginMessageEvent event) {
 
                     try {
                         out.writeUTF("GetSectionPlayerCount");
-                        out.writeInt(section.getServers().stream()
-                                .mapToInt(a -> a.getPlayers().size()).sum());
+                        out.writeInt(section.getServers().stream().reduce(
+                                0,
+                                (integer, serverInfo) -> integer + serverInfo.getPlayers().size(),
+                                Integer::sum));
                     } catch (IOException e) {
                         e.printStackTrace();
                     }