remove bluebird

[minjikarin]

Fixes #209 suggested by @Darseen . code replicated from #207 except the changelog.

confirmed that the test has passed and APIs are called without an issue.

Bluebird official github page suggests "Please use native promises instead if at all possible."

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud