Table bordered=false does not disable borders

[dpisklov]

Bootstrap has explicit styling for borderless table. If neither table-bordered or table-borderless it defaults to semi-bordered version (with horizontal borders dividing header).
There should be a way to use table-borderless class. At the moment it's either table-bordered or nothing, according to Table.js:

      bordered && `${bsPrefix}-bordered`,

[taion]

We'd happily take a PR for this.

[dpisklov]

@taion done #3473

[taion]

thanks!

[dpisklov]

@taion @jquense thanks for a quick turnaround - when can I expect a release with this change included?