Stop reading file after first error to prevent infinite error loop in…

… filter_map

src/words.rs

@@ -31,7 +31,7 @@ fn words_from_file(path: impl AsRef<Path>) -> Result<Vec<String>> {
  let file = File::open(path)?;
  Ok(BufReader::new(file)
  .lines()
- .filter_map(|l| l.ok())
+ .map_while(|l| l.ok())
  .filter(|w| RE.is_match(w))
  .collect())
 }