Add Default implementation for SpidevOptions

Author: eldruin

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 [Full Changelog](https://github.com/rust-embedded/rust-spidev/compare/0.4.1...HEAD)
 
+- Added `Default` implementation for `SpidevOptions`
 - Nix bumped to 0.22
 - bitflags updated to 1.3
 - Minimum supported rust version is now 1.46.0

src/lib.rs

@@ -128,7 +128,7 @@ pub struct Spidev {
 /// Options that are not configured with one of the builder
 /// functions will not be modified in the kernel when
 /// `configure` is called.
-#[derive(Clone)]
+#[derive(Default, Clone)]
 pub struct SpidevOptions {
     pub bits_per_word: Option<u8>,
     pub max_speed_hz: Option<u32>,