v0.1.19

Copulas v0.1.19

Diff since v0.1.18

• Lot of bug fixes on Archimedeans
• Moved to separate generator classes to allow easier future implementation of Liouville copulas and nested Liouville.
• Largely improved documentation (still a way to go though).

Merged pull requests:

• Archimedeans (#73) (@Santymax98)
• Update paper.md (#74) (@Santymax98)
• Update paper.md (#77) (@lrnv)
• Move generators out of archimedeans copulas (#79) (@lrnv)
• Large documentation upgrade (#81) (@lrnv)

Closed issues:

• Move archimedean generators to their own structs. (#63)
• Fix broken kendall tau on GumbelBarnettCopula and InvGaussianCopula (#72)