Update README.md

Author: arucil

README.md

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 # XPBox
-This is 1.10.2 port for Minecraft MOD ExPContainer (made by clocka [[OP Link]](http://forum.minecraftuser.jp/viewtopic.php?t=15105)).  
-This MOD adds a block that stores players' xp and persists, be it broken or the player is dead (acting like ender chests).
+This is 1.10.2 port for Minecraft MOD ExPContainer (originally made by clocka [[OP Link]](http://forum.minecraftuser.jp/viewtopic.php?t=15105), [Flithor](https://github.com/Flithor) ported it to 1.12).  
+This MOD adds a block that stores players' xp and persists, be it broken or the player is dead (acting like ender chests).