Implement Default for all backend structs

This fixes the clippy warning new_without_default [0].

[0] https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default

1 files changed, 2 insertions, 2 deletions

diff --git a/src/backends/stdio.rs b/src/backends/stdio.rs
index 4e4c8ec..9a153df 100644
--- a/src/backends/stdio.rs
+++ b/src/backends/stdio.rs
@@ -9,13 +9,13 @@ use crate::{Choice, Input, Message, Password, Question, Result};
 ///
 /// This backend is intended as a fallback backend to use if no other backend is available.  The
 /// dialogs are printed to the standard output and user input is read from the standard input.
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct Stdio {}
 
 impl Stdio {
     /// Creates a new `Stdio` instance.
     pub fn new() -> Stdio {
-        Stdio {}
+        Default::default()
     }
 }