catcher: Add trailing newline to body text

Since the API provided by this service is intended to be used on the
command line e.g. with `curl`, we need our responses to have a trailing
newline.  This ensures that, when used interactively, the next shell
prompt is correctly placed on a new line, and when used
non-interactively, line-buffered output is correctly flushed (i.e. to a
log file).

src/lib.rs

@@ -4,8 +4,8 @@ use rocket::http::Status;
 #[rocket::catch(default)]
 fn not_found(status: Status, _req: &Request) -> String {
     match status.reason() {
-        Some(s) => s.into(),
-        None => format!("{}", status.code),
+        Some(s) => format!("{s}\n"),
+        None => format!("{}\n", status.code),
     }
 }
 

tests/integration/basic.rs

@@ -17,5 +17,5 @@ fn test_not_found() {
     let client = super::client();
     let response = client.get("/bogus").dispatch();
     assert_eq!(response.status(), Status::NotFound);
-    assert_eq!(response.into_string(), Some("Not Found".into()));
+    assert_eq!(response.into_string(), Some("Not Found\n".into()));
 }