feat: use default on new

Author: CosminPerRam

src/crc.rs

@@ -25,11 +25,8 @@ pub struct CrcReader<R> {
 
 impl Crc {
     /// Create a new CRC.
-    pub fn new() -> Crc {
-        Crc {
-            amt: 0,
-            hasher: Hasher::new(),
-        }
+    pub fn new() -> Self {
+        Self::default()
     }
 
     /// Returns the current crc32 checksum.

src/gz/mod.rs

@@ -324,13 +324,7 @@ pub struct GzBuilder {
 impl GzBuilder {
     /// Create a new blank builder with no header by default.
     pub fn new() -> GzBuilder {
-        GzBuilder {
-            extra: None,
-            filename: None,
-            comment: None,
-            operating_system: None,
-            mtime: 0,
-        }
+        Self::default()
     }
 
     /// Configure the `mtime` field in the gzip header.