prettyping: set meta.mainProgram

pkgs/tools/networking/prettyping/default.nix

@@ -17,6 +17,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     homepage = "https://github.com/denilsonsa/prettyping";
     description = "A wrapper around the standard ping tool with the objective of making the output prettier, more colorful, more compact, and easier to read";
+    mainProgram = "prettyping";
     license = with licenses; [ mit ];
     platforms = platforms.unix;
     maintainers = with maintainers; [ qoelet ];