message: fix(rss): Don't error if the RSS folder doesn't exist.
  It just happened to work if
  You had posts (more than likely)
  Your RSS file was in the root directory of your site
  Otherwise, the destination directory wouldn't exist and you would get an
  error.
diff: -use std::fs::File;
  +use std::fs;
  use std::collections::HashMap;
  use std::io::Write;
  use std::path::Path;
  @@ -290,7 +290,13 @@ fn create_rss(path: &str, dest: &Path, config: &Config, posts: &[Document]) -> R
  let rss_string = channel.to_string();
  trace!("RSS data: {}", rss_string);
  - let mut rss_file = File::create(&rss_path)?;
  + // create target directories if any exist
  + if let Some(parent) = rss_path.parent() {
  + fs::create_dir_all(parent)
  + .map_err(|e| format!("Could not create {:?}: {}", parent, e))?;
  + }
  +
  + let mut rss_file = fs::File::create(&rss_path)?;
  rss_file
  .write_all(br#"<?xml version="1.0" encoding="UTF-8"?>"#)?;
  rss_file.write_all(&rss_string.into_bytes())?;
  