Bump bluebird from 3.5.5 to 3.7.2

Bumps [bluebird](https://github.com/petkaantonov/bluebird) from 3.5.5 to 3.7.2.
- [Release notes](https://github.com/petkaantonov/bluebird/releases)
- [Commits](https://github.com/petkaantonov/bluebird/compare/v3.5.5...v3.7.2)

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

package.json

@@ -27,7 +27,7 @@
     "@sentry/node": "^5.4.0",
     "apple-music-jwt": "^0.2.0",
     "babel-loader": "^8.0.6",
-    "bluebird": "^3.5.5",
+    "bluebird": "^3.7.2",
     "bulma": "^0.7.1",
     "co": "~4.6.0",
     "css-loader": "^2.1.1",