version up to 2.1.5

[smellman]

Thank you for submitting a pull request!

Description

To release @JinIgarashi 's contribution.

Type of Pull Request

• Adding a feature
• Fixing a bug
• Maintaining documents
• Others ()

Verify the followings

• Code is up-to-date with the main branch
• No build errors after npm run build
• No lint errors after npm run lint
• No errors on using charites help globally
• Make sure all the existing features working well
• Have you added at least one unit test if you are going to add new feature?
• Have you updated documentation?

Refer to CONTRIBUTING.MD for more details.