Allow use of ngx-meta in angular 8 project

[mthomasson]

I'm submitting a ... (check one with "x")

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  <!-- Please check the repository for a similar issue or PR before submitting -->
[ ] Support request => <!-- Please check the repository for a similar issue or PR before submitting -->
[x] Feature request
[ ] Documentation issue or request

Current behavior Using the current version generates warnings in the console:

warning " > @ngx-meta/core@7.0.0" has incorrect peer dependency "@angular/core@>=7.0.0 <8.0.0".
warning " > @ngx-meta/core@7.0.0" has incorrect peer dependency "@angular/platform-browser@>=7.0.0 <8.0.0".
warning " > @ngx-meta/core@7.0.0" has incorrect peer dependency "@angular/platform-browser-dynamic@>=7.0.0 <8.0.0".
warning " > @ngx-meta/core@7.0.0" has incorrect peer dependency "@angular/router@>=7.0.0 <8.0.0".

Expected/desired behavior Have a version tha points toward angular 8

Minimal reproduction of the problem with instructions

What is the motivation/use case for changing the behavior? Want to upgrade an Angular 7 project to Angular 8. Environment

• Angular version: 8.1.2

• Browser:

• [x] Chrome (desktop) version XX

• [x] Chrome (Android) version XX

• [x] Chrome (iOS) version XX

• [x] Firefox version XX

• [x] Safari (desktop) version XX

• [x] Safari (iOS) version XX

• [x] IE version XX

• [x] Edge version XX

• For Tooling issues:

• Node version: XX <!-- run node --version -->

• Platform:

• Others:

[rafa-suagu]

some news @fulls1z3 ?

[bjornharvold]

Yes please

[fulls1z3]

done