Fixed compression import typo.

server.js

@@ -9,7 +9,7 @@ if (process.env.NODE_ENV !== "production") require("dotenv").config();
 const app = express();
 const port = process.env.PORT || 5000;
 
-app.use(compression);
+app.use(compression());
 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({ extended: true }));
 app.use(enforce.HTTPS({ trustProtoHeader: true }));