Changes on line 257 of main.js to allow modern Minecraft versions to use this tool.

[AnySpy]

As detailed in issue #91 by LosVocelos, modern Minecraft versions changed the dimension tag to be a string of "minecraft:[DIM]". Using the old version of a byte is no longer supported and results in the map reading "Unknown Map".

This changed line 257 to create an object that defaults to 'minecraft:overworld' if none is provided in Cookies.get('dimension').

As far as compatibility goes, this may break versions prior to 1.16, according to the Minecraft Wiki page on map NBT.

dimension: For <1.16 (byte): 0 = The Overworld, -1 = The Nether, 1 = The End, any other value = a static image with no player pin. In >=1.16 this is the resource location of a dimension instead.