Merge pull request plotly#202 from plotly/updates-2020

Updates 2020

Merge pull request plotly#160 from plotly/2.4.0

2.4.0 release

Bugfixes; removed deprecated react methods; refactor; devDep updates

new events for plotly.js 1.37.0

bugfix release

bumping major version

bumping version

bugfix release

bugfix release for SSR

bugfix release