Bump bluebird from 3.5.5 to 3.7.1

Bumps [bluebird](https://github.com/petkaantonov/bluebird) from 3.5.5 to 3.7.1.
- [Release notes](https://github.com/petkaantonov/bluebird/releases)
- [Commits](petkaantonov/bluebird@v3.5.5...v3.7.1)

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

package.json

@@ -19,7 +19,7 @@
     "@babel/core": "^7.6.4",
     "babel-loader": "^8.0.6",
     "babel-plugin-add-module-exports": "^1.0.2",
-    "bluebird": "^3.5.5",
+    "bluebird": "^3.7.1",
     "chai": "^4.0.2",
     "chart.js": "^2.7.2",
     "css-loader": "^3.2.0",