chore(deps): update express to 4.17 version (#1896)

Author: evilebottnawi

lib/Server.js

@@ -173,13 +173,6 @@ class Server {
     // Init express server
     // eslint-disable-next-line new-cap
     this.app = new express();
-
-    // ref: https://github.com/webpack/webpack-dev-server/issues/1575
-    // ref: https://github.com/webpack/webpack-dev-server/issues/1724
-    // remove this when send@^0.16.3
-    if (express.static && express.static.mime && express.static.mime.types) {
-      express.static.mime.types.wasm = 'application/wasm';
-    }
   }
 
   setupHooks() {