Update dependencies

[stopfstedt]

fixes #878

this leaves the following package dependencies with pending updates

stefan@nichtsnutz: ~/dev/projects/ember-simple-charts on update-deps
$ npm outdated
Package       Current  Wanted  Latest  Location                   Depended by
ember-cli      3.28.5  3.28.5   4.1.1  node_modules/ember-cli     ember-simple-charts
ember-source   3.28.8  3.28.8   4.2.0  node_modules/ember-source  ember-simple-charts

stefan@nichtsnutz: ~/dev/projects/ember-simple-charts/docs on update-deps
$ npm outdated
Package                     Current  Wanted  Latest  Location                                 Depended by
ember-cli                    3.28.5  3.28.5   4.1.1  node_modules/ember-cli                   docs
ember-source                 3.28.8  3.28.8   4.2.0  node_modules/ember-source                docs

[netlify]

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[jrjohnson]

Maybe drop the translations? Maybe not. That's my only comment.