Fix chartArea not yet available when calling setDataLimits

[bendem]

angular.js:14199 TypeError: Cannot read property 'left' of undefined
    at ChartElement.setDataLimits (https://localhost:8003/bower_components/chartjs-plugin-annotation/chartjs-plugin-annotation.js:517:91)
    at ChartElement.initialize (https://localhost:8003/bower_components/chartjs-plugin-annotation/chartjs-plugin-annotation.js:139:9)
    at ChartElement.Chart.Element (https://localhost:8003/bower_components/chart.js/dist/Chart.js:4899:19)
    at ChartElement [as constructor] (https://localhost:8003/bower_components/chart.js/dist/Chart.js:5193:14)
    at new ChartElement (https://localhost:8003/bower_components/chart.js/dist/Chart.js:5193:14)
    at https://localhost:8003/bower_components/chartjs-plugin-annotation/chartjs-plugin-annotation.js:69:20
    at Array.forEach (native)
    at Object.beforeUpdate (https://localhost:8003/bower_components/chartjs-plugin-annotation/chartjs-plugin-annotation.js:63:27)
    at Object.notify (https://localhost:8003/bower_components/chart.js/dist/Chart.js:7346:17)
    at Chart.Controller.update (https://localhost:8003/bower_components/chart.js/dist/Chart.js:4136:16)

[compwright]

Thanks for your submission! At a minimum, this would need to be applied to src/types/line.js also. Could you make this change, and provide a CodePen or JSFiddle test case reproducing the problem that this PR fixes?

[compwright]

Replaced by #80