added dep on canvas to package.json . picked latest version out of laziness to test it / go through changelogs
added dep on canvas to package.json . picked latest version out of laziness to test it / go through changelogs

soldair/node-qrcode,a258379702/node-qrcode,throrin19/node-qrcode,a258379702/node-qrcode,throrin19/node-qrcode