Update Bootstrap 4 wiki

[DzmitryShylovich]

• I'm submitting a ...
  [x] bug report
  [ ] feature request
  [ ] question about the decisions made in the repository
• Do you want to request a feature or report a bug?
  bug
• What is the current behavior?
  Looks like Bootstrap 4 wiki page is out of date and does not work anymore.
• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via
  Just clone the fresh copy of this repo and follow guidelines here.
• What is the expected behavior?
  Wiki page needs to be updated.
• What is the motivation / use case for changing the behavior?
• Please tell us about your environment:
• Angular version: 2.0.0-beta.16
• Browser: Chrome 50.0 Win 10
• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)
  I am getting the following error in browser http://prntscr.com/axpg0w

Update: It was some weird bug with node. After updating to the latest version everything is fine. Closing.