Escape filenames with the $ character

[oliversong]

I'm having issues getting Neoformat to run prettier on a file with a dollar sign in its filename. When I rename the file to not have a dollar sign, it runs properly.

Repro:

1. Make a file with name test.$id.tsx
2. Try to run :Neoformat in it
3. Fails with Neformat: formatters ./node_modules/bin/prettier, clang-format failed to run
4. Rename the file to test.id.tsx
5. Run :Neoformat
6. Works properly

Prettier cli also is able to properly run on this file if run directly from shell. My guess is that Neoformat is not properly escaping the $ character?