React / Chart.js error message

[emilyb7]

On Heroku the console shows this message:

Warning: LineChart: React.createClass is deprecated and will be removed in version 16. Use plain JavaScript classes instead. If you're not yet ready to migrate, create-react-class is available on npm as a drop-in replacement.
printWarning @ main.js:4827
warning @ main.js:4851
createClass @ main.js:75410
Object.defineProperty.value @ main.js:33965
webpack_require @ main.js:20
Object.defineProperty.value @ main.js:34093
webpack_require @ main.js:20
module.exports @ main.js:34440
webpack_require @ main.js:20
Object.defineProperty.value @ main.js:34212
webpack_require @ main.js:20
Object.defineProperty.value @ main.js:32086
webpack_require @ main.js:20
Object.defineProperty.value @ main.js:34387
webpack_require @ main.js:20
(anonymous) @ main.js:66
(anonymous) @ main.js:69

Check this out...

[emilyb7]

should be fixed with #315