update version to 6.1

Merge pull request Querz#55 from Querz/little-endian-io

Little endian io

update version to 5.5

update version to 5.4

make newMCAFile public / check if palette is null

update version to 5.2

update version to 5.1

Merge pull request Querz#41 from Querz/serialization-deserialization-…

…overhaul

Serialization deserialization overhaul

update version to 4.1

Merge pull request Querz#27 from Querz/inconsistencies-fix

Fix inconsistencies