Update ListGroupProjectsOptions to match API

Instead of using ListProjectsOptions, ListGroupProjectsOptions now
matches the specific options defined for ListGroupProjects() in the API.

groups.go

@@ -251,7 +251,22 @@ func (s *GroupsService) SearchGroup(query string, options ...OptionFunc) ([]*Gro
 //
 // GitLab API docs:
 // https://docs.gitlab.com/ce/api/groups.html#list-a-group-39-s-projects
-type ListGroupProjectsOptions ListProjectsOptions
+type ListGroupProjectsOptions struct {
+	ListOptions
+	Archived                 *bool            `url:"archived,omitempty" json:"archived,omitempty"`
+	Visibility               *VisibilityValue `url:"visibility,omitempty" json:"visibility,omitempty"`
+	OrderBy                  *string          `url:"order_by,omitempty" json:"order_by,omitempty"`
+	Sort                     *string          `url:"sort,omitempty" json:"sort,omitempty"`
+	Search                   *string          `url:"search,omitempty" json:"search,omitempty"`
+	Simple                   *bool            `url:"simple,omitempty" json:"simple,omitempty"`
+	Owned                    *bool            `url:"owned,omitempty" json:"owned,omitempty"`
+	Starred                  *bool            `url:"starred,omitempty" json:"starred,omitempty"`
+	WithIssuesEnabled        *bool            `url:"with_issues_enabled,omitempty" json:"with_issues_enabled,omitempty"`
+	WithMergeRequestsEnabled *bool            `url:"with_merge_requests_enabled,omitempty" json:"with_merge_requests_enabled,omitempty"`
+	WithShared               *bool            `url:"with_shared,omitempty" json:"with_shared,omitempty"`
+	IncludeSubgroups         *bool            `url:"include_subgroups,omitempty" json:"include_subgroups,omitempty"`
+	WithCustomAttributes     *bool            `url:"with_custom_attributes,omitempty" json:"with_custom_attributes,omitempty"`
+}
 
 // ListGroupProjects get a list of group projects
 //