it can not used on Windows

[jthou]

>gh  markdown-preview test.md
--: C:\Users\lenovo\AppData\Local\GitHub CLI\extensions\gh-markdown-preview\gh-markdown-preview: /usr/bin/env: bad interpreter: Permission denied

[yusukebe]

Hi @jthou

Can you set an executable flag to the gh-markdown-preview?

chmod +x C:\Users\lenovo\AppData\Local\GitHub CLI\extensions\gh-markdown-preview\gh-markdown-preview