underline time on hover to clarify its a link

Author: stevekrouse

episodes/31.md

@@ -52,6 +52,9 @@ _(Transcript sponsored by [repl.it](https://repl.it/))_
     font-size: 12px;
     color: grey;
   }
+  .time:hover {
+    text-decoration: underline;
+   }
   .block {
    padding: 10px; 
   }