Update reader.rs

just a little typo,

love the project!

src/reader.rs

@@ -311,7 +311,7 @@ impl<R: io::Read> Reader<R> {
  /// Returns a *copy* of the first record in the CSV data as strings.
  ///
  /// This method may be called at any time and regardless of whether
- /// `no_headers` is set or not.
+ /// `has_headers` is set or not.
  ///
  /// ### Example
  ///
@@ -329,7 +329,7 @@ impl<R: io::Read> Reader<R> {
  /// assert_eq!(rows[0], vec![s("1"), s("2"), s("3")]);
  /// ```
  ///
- /// Note that if `no_headers` is called on the CSV reader, the rows
+ /// Note that if `has_headers` is called on the CSV reader, the rows
  /// returned in this example include the first record:
  ///
  /// ```rust