fix spacing in README
fix spacing in README

sunny2601/spree-point-of-sale,sunny2601/spree-point-of-sale,vinsol/spree-point-of-sale,vinsol/spree-point-of-sale,sunny2601/spree-point-of-sale,mkangia/spree-point-of-sale,mkangia/spree-point-of-sale