deno support?

Is your feature request related to a problem? Please describe. I have created a called ffmpeg-templates in deno which uses ffmpeg on the command line.

Describe the solution you'd like It would be fantastic if I could bundle ffmpeg into this library rather than asking users to install an external dependency

Describe alternatives you've considered The current implementation is the alternative, use the system's ffmpeg and ask developers to install it.

Additional context Deno strives for parity with browsers, including webassembly support https://deno.land/manual@v1.5.2/getting_started/webassembly.

denoify is a package that assists in porting npm modules to deno