message: chore(docs): Update bootstrap4.md
  Just use the regular 4.0.0 release instead of the outdated beta.
diff: @@ -22,7 +22,7 @@ ng serve
  - install `ngx-bootstrap` and `Bootstrap 4`
  ```bash
  - npm install ngx-bootstrap bootstrap@next --save
  + npm install ngx-bootstrap bootstrap --save
  ```
  ### Using with css
  