Alias event as report

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

opensmtpd-derive/src/lib.rs

@@ -64,3 +64,8 @@ pub fn event(attr: TokenStream, input: TokenStream) -> TokenStream {
     };
     output.into()
 }
+
+#[proc_macro_attribute]
+pub fn report(attr: TokenStream, input: TokenStream) -> TokenStream {
+    event(attr, input)
+}

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)]
+#[report(Any)]
-fn on_event(ctx: &mut MyContext, entry: &Entry) {
+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();
 }

opensmtpd/src/lib.rs

@@ -14,7 +14,7 @@ pub use crate::entry::{Entry, Event};
 pub use crate::errors::Error;
 pub use crate::event_handlers::{Callback, EventHandler, MatchEvent};
 pub use crate::logger::SmtpdLogger;
-pub use opensmtpd_derive::event;
+pub use opensmtpd_derive::{event, report};
 
 #[macro_export]
 macro_rules! handlers {