lua

The current README.md has the legacy hyprland config, and does not give an example using the new lua config style.

```lua
-- Screenshots with hyprshot
hl.bind(mainMod .. " + PRINT",          hl.dsp.exec_cmd("hyprshot -m window"))
hl.bind("PRINT",                        hl.dsp.exec_cmd("hyprshot -m output"))
hl.bind("SHIFT + PRINT",                hl.dsp.exec_cmd("hyprshot -m region"))
```