remove all updater to solve CC-BY-NC-SA and Newtonsoft license issues

Fix for #19

README.md

@@ -4,7 +4,6 @@ This Minetest mod offers changeable player skins with a graphical interface for
 
 ## Features
 
-- Download scripts included for the [Minetest skin database](http://minetest.fensta.bplaced.net)
 - Flexible skins API to manage the database
 - [character_creator](https://github.com/minetest-mods/character_creator) support for custom skins
 - Skin change menu for sfinv (in minetest_game) and [unified_inventory](https://forum.minetest.net/viewtopic.php?t=12767)
@@ -16,23 +15,8 @@ This Minetest mod offers changeable player skins with a graphical interface for
 - Full [3d_armor](https://forum.minetest.net/viewtopic.php?t=4654) support
 - Compatible to 1.0 and 1.8 Minecraft skins format
 
-## Update tools
-
-In order to download the skins from the skin database,
-you may use one of the listed update tools below.
-They are located in the `updater/` directory.
-
-- `update_skins_db.sh` bash and jq required
-- `update_from_db.py` python3 required
-- `MT_skins_updater.*` windows or mono (?) required
-
-
-## License
-
-If nothing else is specified, it is licensed as GPLv3.
-
-Fritigern:
-  - update_skins_db.sh (CC-BY-NC-SA 4.0)
+## License:
+- GPLv3
 
 ### Credits