Bump bootstrap from 3.3.6 to 3.4.1

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 3.3.6 to 3.4.1.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v3.3.6...v3.4.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -35,7 +35,7 @@
     "@webcomponents/webcomponentsjs": "^1.1.0",
     "animate.css": "^3.5.2",
     "backbone": "~1.3.3",
-    "bootstrap": "3.3.6",
+    "bootstrap": "3.4.1",
     "bootstrap-3-typeahead": "^4.0.2",
     "bootstrap-colorpicker": "2.3.6",
     "bootstrap-notify": "git://github.com/mouse0270/bootstrap-notify#master",