Alias event as report

This alias is made so people with OpenSMTPD filters knowledge will
directly understand that events are reports.

opensmtpd/examples/session_event_counter.rs

@@ -1,18 +1,18 @@
 use log::{info, Level};
-use opensmtpd::{event, handlers, Entry, SmtpIn, SmtpdLogger};
+use opensmtpd::{handlers, report, Entry, SmtpIn, SmtpdLogger};
 
 #[derive(Clone, Default)]
 struct MyContext {
     nb: usize,
 }
 
-#[event(Any)]
-fn on_event(ctx: &mut MyContext, entry: &Entry) {
+#[report(Any)]
+fn on_report(ctx: &mut MyContext, entry: &Entry) {
     ctx.nb += 1;
     info!("Event received: {}, {}", entry.session_id, ctx.nb);
 }
 
 fn main() {
     let _ = SmtpdLogger::new().set_level(Level::Debug).init();
-    SmtpIn::new().event_handlers(handlers!(on_event)).run();
+    SmtpIn::new().event_handlers(handlers!(on_report)).run();
 }