Add call to create notification.

src/main.rs

@@ -5,6 +5,7 @@ mod githubctl;
 mod json_util;
 
 use githubctl::PullRequestEvent;
+use notify_rust::{Hint, Notification};
 use serde_json;
 
 const USERNAME: &'static str = include_str!("../.username");
@@ -29,6 +30,16 @@ fn handle_event(event: serde_json::Value) -> Result<(), Box<dyn std::error::Erro
         let event = PullRequestEvent::new(&event)?;
         if event.action == "opened" {
             println!("PullRequestEvent action {}", event.action);
+            let notification_body = format!("Pull Request opened: {}", event.title);
+            Notification::new()
+                .summary("Pull request opened.")
+                .body(notification_body.as_str())
+                // .icon("can be a full path to an image file")
+                .appname("github_watcher")
+                .hint(Hint::Category("im.received".to_owned()))
+                .hint(Hint::Resident(true))
+                .timeout(0)
+                .show()?;
         }
     }
     Ok(())