Update README.md in preparation for 2.7.0 - JSON marshaling/unmarshal…

…ing finally fixed

feat: add ContainsOne method (#134)

* feat: add ContainsOne method

* chore: removed unnecessary word

Add Sorted method (#127)

* Add Sorted method

This is a varient on `slices.Sorted` that makes it easy to get a sorted slice. This makes it easy to get the elements of the set into a sorted slice. Quite handy when using sets to build up unique elements but then needing a well defined iteration order.

* Move to own file that can be build tagged

* Also test go 1.21

* Fix error messages in test

feat: add is empty functionality to set (#133)

fix: Deserialize using a generic approach. (#121)

Reintegrating optimizations originally proposed by @fy0 in issue:60 f…

…or set instantiation to utilize capacity hint where possible (#113)

Release 2.2.0 (#112)

* Updating workflow and README

* modifying workflow file

* fix workflow go version

* workflow array syntax

* fixing workflow

* moron, it's pulling go 1.2.2

* if it ain't broke...

feat: improve Add performance

bump go.mod file

fix go mod