update links in readme
update links in readme

MajorMJR/factorio-server-manager,sean-callahan/factorio-server-manager,sean-callahan/factorio-server-manager,sean-callahan/factorio-server-manager,MajorMJR/factorio-server-manager,MajorMJR/factorio-server-manager,sean-callahan/factorio-server-manager,MajorMJR/factorio-server-manager