Update the plugin version and date automatically

[ryantxu]

use the package.json version and current date in plugin.json

[ryantxu]

@davkal -- can you take another look? thanks

[davkal]

Changes look good! Could you please rebase and fix conflict again?

(Also, do you have owner push enabled? I got permission denied when trying to push a new yarn.lock.)

[ryantxu]

@davkal -- merged with master, should be good now.

"do you have owner push enabled?"

anything else?