release 2.0.0

add permutations, isEqual, isEqualBy & isEqualWith method

add groupBy method

add uniq, uniqBy & uniqWith methods

remove generator.compose dependency and create iterative implementati…

…on of cartesian product that does not use any dependency (trying to improve cartesian performance).

use own compose version that does not need reverse parameters to impr…

…ove cartesian performance

replace spread operator copy by slice copy to increase cartesian meth…

…od performance

avoid unnecessary array copies to improve cartesian method performance

using [email protected] to improve performance of cartesian method

improve cartesian method performance