Fix completing tasks, showing completed tasks, and stable display order. Sorting broken.

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"local/todo-server/config"
 	"local/todo-server/server"
+	"log"
 	"net/http"
 )
 
@@ -11,6 +12,7 @@ func main() {
 	if err := s.Routes(); err != nil {
 		panic(err)
 	}
+	log.Println("listening on", config.Port)
 	if err := http.ListenAndServe(config.Port, s); err != nil {
 		panic(err)
 	}