feat(progressbar): specify height

[chenyuzhcy]

#1904

[maxokorokov]

Thanks, just one minor comment about documentation.

Also this will change in 4.0.0-beta.2, as the height will be set on <div class="progress"> directly, so this will need to be updated soon.

[maxokorokov]

I guess we should clarify, as it will end up in the documentation:

Something like:
Height of the progress bar. Accepts any valid CSS height values, ex. '2rem'

[chenyuzhcy]

what's the best way to make sure to update that when we upgrade?

[maxokorokov]

I guess the easiest would be for you to realign and update current PR once #1914 will land in master. Or just test locally with beta.2

[maxokorokov]

Please align with latest Bootstrap markup:

https://getbootstrap.com/docs/4.0/components/progress/#height

[maxokorokov]

Thanks for contributing, @chenyuzhcy!
If you're interested, there is another progress bar feature missing (#905) that need a little design first.