Added issue reference, see https://github.com/phetsims/joist/issues/64 and https://github.com/phetsims/joist/issues/384
Added issue reference, see https://github.com/phetsims/joist/issues/64 and https://github.com/phetsims/joist/issues/384

phetsims/joist,phetsims/joist,phetsims/joist