add difficulties

src/server/GameServer.ts

@@ -30,12 +30,16 @@ export class GameServer {
         public readonly isPublic: boolean,
         private config: Config,
         private gameConfig: GameConfig,
+        
     ) { }
 
     public updateGameConfig(gameConfig: GameConfig): void {
         if (gameConfig.gameMap != null) {
             this.gameConfig.gameMap = gameConfig.gameMap
         }
+        if(gameConfig.difficulty != null) {
+            this.gameConfig.difficulty = gameConfig.difficulty
+        }
     }
 
     public addClient(client: Client, lastTurn: number) {