Bump bootstrap from 3.3.7 to 4.0.0

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 3.3.7 to 4.0.0.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v3.3.7...v4.0.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

yarn.lock

@@ -11,8 +11,8 @@ bootstrap-tagsinput@*:
   resolved "https://registry.yarnpkg.com/bootstrap-tagsinput/-/bootstrap-tagsinput-0.7.1.tgz#ffe3b06bbe2a106945ef2814568005a94f211937"
 
 bootstrap@*:
-  version "3.3.7"
-  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-3.3.7.tgz#5a389394549f23330875a3b150656574f8a9eb71"
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-4.0.0.tgz#ceb03842c145fcc1b9b4e15da2a05656ba68469a"
 
 camelcase@^2.0.1:
   version "2.1.1"