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](https://github.com/twbs/bootstrap/compare/v3.3.7...v3.4.1)

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

package.json

@@ -26,7 +26,7 @@
     "babel-runtime": "^6.6.1",
     "bluebird": "^3.3.3",
     "body-parser": "^1.13.3",
-    "bootstrap": "~3.3.7",
+    "bootstrap": "~3.4.1",
     "bootstrap-social": "^5.0.0",
     "composable-middleware": "^0.3.0",
     "connect-mongo": "^1.2.1",