Update README.md

keyboard/planck/README.md

@@ -54,6 +54,3 @@ _The only applicable keymaps will work with this option._ Common keymaps follow
 - [Pierre's Fork](https://github.com/pcarrier/tmk_keyboard/blob/pcarrier/planck/keyboard/gh60/keymap_planck.c)
 - [Nathan's Fork](https://github.com/nathanrosspowell/tmk_keyboard/tree/planck-jack/keyboard/planck)
 - [Matthew's Fork](https://github.com/pepers/tmk_keyboard/tree/master/keyboard/planck_grid)
-
-## Environment Setup
-