wasm-server.js in prism-cli-0.0.6 vs wasm-server.js in prism-cli-0.0.7

@@ -1,9 +1,10 @@
 const http = require('http');
 const fs = require('fs');
 const path = require('path');
 
+const port = parseInt(process.argv[2], 10) || 3042;
 const proxy = http.createServer((req, res) => {
   let p = path.join('.', req.url);
 
   if (req.url === '/') {
     p = path.join('.', 'index.html');
@@ -21,7 +22,7 @@
     res.write(e.toString());
   }
   res.end();
 });
 
-console.log("Listening on localhost:3042");
-proxy.listen(3042, '127.0.0.1');
+console.log(`Listening on localhost:${port}`);
+proxy.listen(port, '127.0.0.1');