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, 7 deletions

diff --git a/src/backends/zenity.rs b/src/backends/zenity.rs
index d5745eb..0deca0a 100644
--- a/src/backends/zenity.rs
+++ b/src/backends/zenity.rs
@@ -8,7 +8,7 @@ use crate::{Choice, Error, Input, Message, Password, Question, Result};
 /// The `zenity` backend.
 ///
 /// This backend uses the external `zenity` program to display GTK+ dialog boxes.
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct Zenity {
     icon: Option<String>,
     width: Option<String>,
@@ -19,12 +19,7 @@ pub struct Zenity {
 impl Zenity {
     /// Creates a new `Zenity` instance without configuration.
     pub fn new() -> Zenity {
-        Zenity {
-            icon: None,
-            width: None,
-            height: None,
-            timeout: None,
-        }
+        Default::default()
     }
 
     /// Sets the icon of the dialog box.