Update dependencies and fix eslint violations

[nabdelgadir]

Related issues

• connect to https://github.com/strongloop-internal/scrum-apex/issues/425

Checklist

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

[dhmlau]

Please create a follow up PR to remove CI for Node.js 4 and 6. Thanks.