Please add a separate demo instead of changing the existing one

Here are the classes which have to be changed in the sample:

"help-block" becomes"invalid-feedback"
"has-error" becomes"is-invalid"
"has-success" becomes"is-valid"

Other changes are needed to the sample:

• use the new Bootstrap URL (doh!)
• formatting of the HTML elements

Hi@vairamsvsjdo and@gwhenne,

Could any of you create a new demo with Bootstrap v4 instead of updating the Boostrap v3 one? We don't want to replace that demo as there are still people using Boostrap v3 out there.

Thanks!

Hi there,

I'm closing this PR in favor of#2173 which adds a new demo for Bootstrap v4.

Thanks@vairamsvsjdo for your contribution, though.