Update edit example

Added top padding to dialog and a `!` to message.

examples/edit.rs

@@ -8,12 +8,13 @@ fn main() {
 
     // Create a dialog with an edit text and a button.
     siv.add_layer(Dialog::new(IdView::new("edit", EditView::new().min_length(20)))
+                  .padding((1,1,1,0))
                   .title("Enter your name")
                   .button("Ok", |s| {
                       // When the button is clicked, read the text and print it in a new dialog.
                       let content = {
                           let name = s.find::<EditView>(&Selector::Id("edit")).unwrap().get_content();
-                          format!("Hello {}", name)
+                          format!("Hello {}!", name)
                       };
                       s.pop_layer();
                       s.add_layer(Dialog::new(TextView::new(&content))