add redirect, since blog post URL changed

SethTisue · SethTisue · commit f21a70d4874d · 2023-07-23T13:01:29.000-07:00
diff --git a/_posts/2023-07-17-signature-polymorphic-methods.md b/_posts/2023-07-17-signature-polymorphic-methods.md
@@ -3,6 +3,8 @@ layout: blog-detail
 post-type: blog
 by: Seth Tisue, Lightbend
 title: "Signature polymorphic methods in Scala"
+redirect_from:
+  - /blog-detail/2023/07/17/signature-polymorphic-methods.html
 ---
 
 Java 7 introduced a curious and little-known feature to the Java
