cannot expand default MessageParser settings

[vthriller]

Any header_*() or with_*() option discards default settings, and existing with_*()-shortcuts don't cover all of the defaults.

Exhibit A

diff --git a/examples/message_parse.rs b/examples/message_parse.rs
index 1b450f6..79b22eb 100644
--- a/examples/message_parse.rs
+++ b/examples/message_parse.rs
@@ -48,7 +48,9 @@ R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
 --festivus--
 "#;
 
-    let message = MessageParser::default().parse(input).unwrap();
+    let message = MessageParser::default()
+        .header_text("Organization")
+        .parse(input).unwrap();
 
     // Parses addresses (including comments), lists and groups
     assert_eq!(

thread 'main' panicked at examples/message_parse.rs:57:24:
called `Option::unwrap()` on a `None` value
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Exhibit B

diff --git a/examples/message_parse.rs b/examples/message_parse.rs
index 1b450f6..d150698 100644
--- a/examples/message_parse.rs
+++ b/examples/message_parse.rs
@@ -13,6 +13,7 @@ To: "Colleagues": "James Smythe" <james@vandelay.com>; Friends:
 Date: Sat, 20 Nov 2021 14:22:01 -0800
 Subject: Why not both importing AND exporting? =?utf-8?b?4pi6?=
 Content-Type: multipart/mixed; boundary="festivus";
+List-Unsubscribe: <imouttahere@vandelay.com>
 
 --festivus
 Content-Type: text/html; charset="us-ascii"
@@ -48,7 +49,23 @@ R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
 --festivus--
 "#;
 
-    let message = MessageParser::default().parse(input).unwrap();
+    let message = MessageParser::default()
+        .header_text("Organization")
+        // use all of the shortcuts available
+        .with_mime_headers()
+        .with_address_headers()
+        .with_date_headers()
+        .with_message_ids()
+        .with_minimal_headers()
+        .parse(input).unwrap();
+
+    assert_eq!(
+        message.header("list-unsubscribe").unwrap().clone().unwrap_address().first().unwrap(),
+        &Addr::new(
+            None,
+            "imouttahere@vandelay.com"
+        )
+    );
 
     // Parses addresses (including comments), lists and groups
     assert_eq!(

thread 'main' panicked at src/core/header.rs:86:18:
HeaderValue::unwrap_address called on non-Address value
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

New test works with just default()