feat: remove explicit clone impl for Crc

Author: CosminPerRam

src/crc.rs

@@ -8,7 +8,7 @@ use crc32fast::Hasher;
 /// The CRC calculated by a [`CrcReader`].
 ///
 /// [`CrcReader`]: struct.CrcReader.html
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct Crc {
     amt: u32,
     hasher: Hasher,
@@ -23,12 +23,6 @@ pub struct CrcReader<R> {
     crc: Crc,
 }
 
-impl Default for Crc {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
 impl Crc {
     /// Create a new CRC.
     pub fn new() -> Crc {