Update to BootStrap 4

[doublesam20]

bootstrap-session-timeout/dist/bootstrap-session-timeout.js

Line 114 in 08f8f2a

$('#session-timeout-dialog').data('bs.modal').isShown) {

.isShown dosen't work on Bootstrap4. Update to ._isShown
Regards.

[thewebartisan7]

You can find here a fix for this #55