Commits on Oct 17, 2019

1. fix: Preprocessors may return promises, but not content. …

   The original API for Preprocessors assumed callback.
   Now promises are a valid return.
   If an implementer returns a promise from `process`
   but only resolves content via the callback,
   then while the result of `process` is a promise,
   it will not resolve to the intended content.
   An easy example is for `process` to be an `async` function.
   e.g.
   ```
   async function process(content, file, done) {
      const newContent = await magic(content)
      done(newContent)
   }
   ```

   

   seebees committed Oct 17, 2019
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