Upgrade ngx-boostrap to version 8 in ng-dynamic-forms/ui-bootstrap

[MrDWilson]

I'm submitting a

[ ] Bug / Regression
[x ] Feature Request / Proposal

I'm using

NG Dynamic Forms Version: `X.Y.Z`

[ ] Basic UI
[x ] Bootstrap UI  
[ ] Foundation UI
[ ] Ionic UI
[ ] Kendo UI
[ ] Material  
[ ] NG Bootstrap
[ ] Prime NG

Description

The main package.json for ng-dynamic-forms has version ^8.0.0 for ngx-bootstrap, but the ui-bootstrap module is still using version 6. Could this be upgraded and released?