feat: add 'flags' method to add multiple flags at once

src/client.rs

@@ -100,6 +100,12 @@ impl<'a, T: Read + Write> AppendCmd<'a, T> {
         self
     }
 
+    /// Append an array of flags
+    pub fn flags(&mut self, flags: &'a [Flag<'a>]) -> &mut Self {
+        self.flags.append(&mut flags.to_vec());
+        self
+    }
+
     /// Set the internal date
     pub fn internal_date(&mut self, date: DateTime<FixedOffset>) -> &mut Self {
         self.date = Some(date);

tests/imap_integration.rs

@@ -304,8 +304,7 @@ fn append_with_flags() {
     //append
     let flags: &[Flag] = &[Flag::Seen, Flag::Flagged];
     c.append(mbox, e.message_to_string().unwrap().as_bytes())
-        .flag(Flag::Seen)
-        .flag(Flag::Flagged)
+        .flags(flags)
         .run()
         .unwrap();