Update bluebird requirement from ~2.9.30 to ~3.5.3

Updates the requirements on [bluebird](https://github.com/petkaantonov/bluebird) to permit the latest version.
- [Release notes](https://github.com/petkaantonov/bluebird/releases)
- [Changelog](https://github.com/petkaantonov/bluebird/blob/master/changelog.md)
- [Commits](https://github.com/petkaantonov/bluebird/commits/v3.5.3)

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

Author: dependabot-support

package.json

@@ -61,7 +61,7 @@
     "@types/react": "^16.0.19",
     "@types/react-dom": "^16.0.2",
     "async": "^0.9.0",
-    "bluebird": "~2.9.30",
+    "bluebird": "~3.5.3",
     "bootstrap": "^3.3.6",
     "core-js": "^2.5.1",
     "expect.js": "~0.3.1",