asarUpdate: fix not following redirect

src/asarUpdate.js

@@ -7,21 +7,23 @@ const downloadPath = join(asarPath, '..', 'app.asar.download');
 
 const asarUrl = `https://github.com/GooseMod/OpenAsar/releases/download/${oaVersion.split('-')[0]}-cirelease/app.asar`;
 
+// todo: have these https utils centralised?
+const redirs = url => new Promise(res => get(url, r => { // Minimal wrapper around https.get to follow redirects
+  const loc = r.headers.location;
+  if (loc) return redirs(loc).then(res);
+
+  res(r);
+}));
+
 module.exports = async () => { // (Try) update asar
   log('AsarUpdate', 'Updating...');
 
   if (!oaVersion.includes('-')) return;
 
-  await new Promise((res) => {
-    const file = fs.createWriteStream(downloadPath);
-
-    file.on('finish', () => {
-      file.close();
-      res();
-    });
+  const file = fs.createWriteStream(downloadPath);
+  (await redirs(asarUrl)).pipe(file);
 
-    get(asarUrl, r => r.pipe(file));
-  });
+  await new Promise(res => file.on('finish', res));
 
   if (fs.readFileSync(downloadPath, 'utf8').startsWith('<')) return log('AsarUpdate', 'Download error');