nut: update livecheck

Author: cho-m

Formula/n/nut.rb

@@ -7,7 +7,8 @@ class Nut < Formula
 
   livecheck do
     url :stable
-    strategy :github_latest
+    regex(/^v?(\d+(?:\.\d+)+)$/i)
+    strategy :github_releases
   end
 
   bottle do