Add support for 'back' and 'forward' mouse buttons

MouseButton events will now also trigger when the 'back' and 'forward'
mouse buttons are pressed. These buttons aren't present on all mice.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/events.rs b/src/events.rs
index 7729a63..22cada5 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -77,6 +77,8 @@ pub enum MouseButton {
     Left,
     Middle,
     Right,
+    Back,
+    Forward,
 }