text: Title: Allow specifying additional files to watch
  Body: `rio run` automatically restarts the project when changes to Python files are detected. Some projects also depend on other files however, such as JSON or CSV data files. It would be nice for `rio run` to watch those as well.
  
  There's a couple approaches to solving this:
  
  
  1. Allow adding "negative" paths to `.rioignore.
  2. Add command-line flags for this
  3. Allow adding paths to `rio.toml` 
  
  