Ng version update

[hutcj]

PR Checklist

• [x] Read our contributing guidelines: https://github.com/progress/JSDO/blob/master/contributing.md#contribute-to-the-code-base.

Added support for Angular 7 & 8. Checked that there were no applicable breaking changes in update guide.

Note: npm test currently fails on 4 tests on the master branch - these updates don't introduce any new errors, however.

[audaciousanil]

Hi @hutcj

Please create pull request targeting 'develop' branch. Current PR #267 is targeting to 'master' branch.

Thanks, Anil Kumar

[edselg]

@hutcj

Thank you for your contribution!

Related issue:

• https://github.com/progress/JSDO/issues/266