Don't delete README

Author: jakebailey

scripts/produceLKG.ts

@@ -13,7 +13,7 @@ const copyright = fs.readFileSync(path.join(__dirname, "../CopyrightNotice.txt")
 
 async function produceLKG() {
     console.log(`Building LKG from ${source} to ${dest}`);
-    await del(dest);
+    await del(`${dest.replace(/\\/g, "/")}/**`, { ignore: ["**/README.md"] });
     await fs.mkdirp(dest);
     await copyLibFiles();
     await copyLocalizedDiagnostics();