update flake last tag

Author: mikeland73

flake.nix

@@ -17,7 +17,7 @@
       let
         pkgs = nixpkgs.legacyPackages.${system};
 
-        lastTag = "0.14.2";
+        lastTag = "0.15.1";
 
         revision = if (self ? shortRev) then "${self.shortRev}" else "${self.dirtyShortRev or "dirty"}";