last fix version chart.js

[SSvishnevsky]

Description of change

Pull Request check-list

• [ ] Run gulp test to ensure there are no linting, or style issues and all tests pass.
• [ ] Squash your commits into a few commits only.
• [ ] Make sure the commit message is short, concise and descriptive of the issues you're fixing.
• [ ] Avoid mixing up multiple issues and/or features, open one pull request for each issue.
• [ ] Have you updated the documentation and / or examples?
• [ ] Have you included a new test?

[benmccann]

The latest is now 2.8.x. However, why don't you add a caret at the beginning to allow it to pick up the latest version automatically. I.e. ^2.3.x