Fix clone.

src/reader.rs

@@ -23,7 +23,7 @@ use self::ParseState::{
 ///
 /// Generally, you won't need to use this type because `CRLF` is the default,
 /// which is by far the most widely used record terminator.
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub enum RecordTerminator {
  /// Parses `\r`, `\n` or `\r\n` as a single record terminator.
  CRLF,
@@ -817,7 +817,7 @@ impl<R: io::Read + io::Seek> Reader<R> {
  }
 }
 
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 struct ParseMachine {
  delimiter: u8,
  record_terminator: RecordTerminator,
@@ -826,7 +826,7 @@ struct ParseMachine {
  double_quote: bool,
 }
 
-#[derive(Copy, Eq, PartialEq, Debug)]
+#[derive(Clone, Copy, Eq, PartialEq, Debug)]
 enum ParseState {
  StartRecord,
  EndRecord,

src/writer.rs

@@ -10,7 +10,7 @@ use {
 };
 
 /// The quoting style to use when writing CSV data.
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub enum QuoteStyle {
  /// This puts quotes around every field. Always.
  Always,