Add support for pipeline events

src/event.rs

@@ -44,8 +44,6 @@ pub enum MergeRequestAction {
     Closed,
     #[serde(rename = "reopen")]
     Reopened,
-    #[serde(rename = "update")]
-    Updated,
     #[serde(rename = "approved")]
     Approved,
     #[serde(rename = "unapproved")]
@@ -62,7 +60,6 @@ impl MergeRequestAction {
             MergeRequestAction::Opened => "opened",
             MergeRequestAction::Closed => "closed",
             MergeRequestAction::Reopened => "reopened",
-            MergeRequestAction::Updated => "updated",
             MergeRequestAction::Approved => "approved",
             MergeRequestAction::Unapproved => "unapproved",
             MergeRequestAction::Merged => "merged",