issue.rs: add fmt::Display for State

src/issue.rs

@@ -1,3 +1,4 @@
+use core::fmt;
 use std::io::Write;
 use std::str::FromStr;
 
@@ -62,6 +63,21 @@ impl FromStr for State {
     }
 }
 
+impl fmt::Display for State {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let fmt_str = match self {
+            State::New => "new",
+            State::Backlog => "backlog",
+            State::Blocked => "blocked",
+            State::InProgress => "inprogress",
+            State::Done => "done",
+            State::WontDo => "wontdo",
+            
+        };
+        write!(f, "{fmt_str}")
+    }
+}
+
 impl Issue {
     pub fn new_from_dir(dir: &std::path::Path) -> Result<Self, IssueError> {
         let mut description: Option<String> = None;