use plaintext as default lang

src/misc/markdown.rs

@@ -47,7 +47,7 @@ pub fn get_options() -> ComrakOptions {
         },
         parse: ComrakParseOptions {
             smart: false, // true one day?
-            default_info_string: None,
+            default_info_string: Some("plaintext".to_owned()),
             relaxed_tasklist_matching: true,
         },
         render: ComrakRenderOptions {