[BUG] Fails if there's a space in filename

[waqarHocain]

If there is a space in filename, it fails.
Here's a simple program with space in filename:

  const convert = require("ebook-convert");
   const inputFile = path.join(__dirname, "Crisis Caravan.epub");
   const outFile = path.join(__dirname, "Crisis Caravan.pdf");                 
   const options = {
     input: inputFile, //path to epub
     output: outFile, //path to pdf
   };
   convert(options, function (err) {
     if (err) console.log(err);
   });

This program fails with a Command failed error. But if you remove space from filename, it converts file successfully.

[waqarHocain]

#9