chore: Updated angular dependencies to 8.0.0

[mramos-dev]

Please check if the PR fulfills these requirements

• [ ] The commit message follows our guidelines: https://github.com/HackedByChinese/ng2-idle/blob/master/CONTRIBUTING.md#pr
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[X] Other... Please describe: Updated version of Angular dependencies to 8.0.0.

What is the current behavior? (You can also link to an open issue here) Currently, version of Angular dependencies is 7.x.x.

What is the new behavior? The version of Angular dependencies should be 8.x.x.

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[X] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[coveralls]

Coverage remained the same at 99.372% when pulling 6a1b94388ff1c11f744c9048bb1854941d12bb71 on MRamos62786:ng8update into 761d7e26bd5a8c0b95ca6e1a4009b757e0e65af0 on HackedByChinese:master.

[duluca]

@HackedByChinese any plans to merge this in?

[Jodelautomat]

if somehow possible, please merge this in. would love to upgrade to angular 8!

[moribvndvs]

I've been working on restructuring the repository completely, which includes upgrading to Angular 8. A beta release will be out shortly.