* Add parameter Simple to ListProjectsOptions struct

Enables you to query list of projects with minimal
information much faster.

ListProjectsOptions{
  Simple *bool url:"simple,omitempty" json:"simple,omitempty"
}

Fields returned:
ID, HTTPURLToRepo, WebURL, Name, NameWithNameSpace, Path
PathWithNamesPace

* Add parameter Visibility to ListProjectOptions

Limit by visibility public, internal or private

ListProjectOptions{
  Visibility *string url:"visibility:omitempty" json:"visibility,omitempty"
}