Set up `version` script
Set up `version` script

Now there's no need to generate dist in a separate commit. Just need to
create new versions through `npm run version <version>`.

Closes #43.

reactabular/reactabular,kaushik94/reactabular,adjohnson916/reactabular,rdoh/reactabular,reactabular/reactabular,megawidget/reactabular,kaushik94/reactabular,megawidget/reactabular,adjohnson916/reactabular