delete is too slow

First of all thanks for this amazing tool.

Describe the bug npkill finds the node_modules, I hit space to delete, it says deleting and takes like 2-3 min per folder.

To Reproduce Steps to reproduce the behavior:

• Run npkill on macos
• Total size reported was > 20GB
• Hit space for few folders

Expected behavior Delete should be fast

Screenshots

• OS: Macos
• Version: 0.11.3