Fix path in dev mode

lib/utils.js

@@ -25,7 +25,8 @@ const developmentPrivateDir = () => {
   if (!isDevEnv())
     return;
   // In development, using `pwd` is fine. Remove the .meteor/foo/bar stuff though.
-  const meteorRoot = process.cwd().replace(/(\.meteor.*)/g, '');
+  const reg = new RegExp(path.sep+'\.meteor.*','g');
+  const meteorRoot = process.cwd().replace(reg, '');
   return path.join(meteorRoot, 'private');
 };