build(deps-dev): bump bootstrap from 3.3.7 to 3.4.1

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 3.3.7 to 3.4.1.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v3.3.7...v3.4.1)

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

Author: dependabot[bot]

package-lock.json

@@ -55,7 +55,7 @@
     "@fortawesome/fontawesome-free": "5.3.1",
     "babel-core": "6.26.3",
     "babel-preset-es2015": "6.24.1",
-    "bootstrap": "3.3.7",
+    "bootstrap": "3.4.1",
     "jquery": "3.2.1",
     "jquery-easing": "0.0.1",
     "connect-livereload": "0.6.0",