GPLSIM version 0.9.1

This is a hot fix for the function It has been changed to plot_si as it is not a S3 method. And the augments are now handled well.

GPLSIM version 0.9.2

We now include unit tests and formula methods!

We also added more supports on distributions, such as Gamma.

GPLSIM version 0.9.3

Allowed for large toleration when testing.

GPLSIM version 1.0.0

Removed unnecessary arguments.