Add Rsubbotools

[Beliavsky]

I suggest adding

Rsubbotools: Fast Estimation of Subbottin and AEP Distributions (Generalized Error Distribution)
https://cran.r-project.org/web/packages/Rsubbotools/index.html

in the section "Exponential distribution and its extensions" of the task view.

[dutangc]

It seems that your package implement a lot of probability distibutions: Laplace (both symmetric and asymmetric), power Laplace, skewed exponential. Could you prepare some sentences to be incorporated? in particular the package could be mentionned at many points.