chore: update copyrights years

[agnes512]

Description

Related issues

• connect to https://github.com/strongloop-internal/scrum-apex/issues/406

Checklist

• [ ] New tests added or existing tests modified to cover all changes
• [ ] Code conforms with the style guide

[dhmlau]

@nabdelgadir is right. I've merged PR https://github.com/strongloop/strong-remoting/pull/467. Let's close this PR then. Thanks.