fixed database.ts (#102)

src/utils/database.ts

@@ -21,7 +21,8 @@ if ("password" in config.mongoOptions) password = encodeURIComponent(config.mong
 
 const mongoClient = new MongoClient(
     username
-        ? `mongodb://${username}:${password}@${config.mongoOptions.host}?authMechanism=DEFAULT&authSource=${config.mongoOptions.authSource}`
+        ? `mongodb://${username}:${password}@${config.mongoOptions.host}/${config.mongoOptions.database}` +
+          `?authMechanism=DEFAULT&authSource=${config.mongoOptions.authSource}`
         : `mongodb://${config.mongoOptions.host}`
 );
 await mongoClient.connect();