Ngx-chips: Update to work with Angular 8

[craig-dae]

I'm submitting a ... (check one with "x")
```
[x] bug report => search github for a similar issue or PR before submitting
[ ] support request/question

Current behavior
Appears to bug out on Angular 8 with: ERROR TypeError: defaults$2 is not a constructor

Expected behavior
Updated to work with Angular 8

Minimal reproduction of the problem with instructions (if applicable)
Update to Angular 8

What do you use to build your app?. Please specify the version
angular-cli

Angular version:
8

ngx-chips version:
2.0.0-beta.0

Browser: Chrome

[wozniakm]

It should work with the latest version (from master), but there is another bug that makes not possible to build the code.

[Marcelh1983]

Today I did a attempt to support Angular8. I upgraded all packages.
Everything seems to work fine but still have some work to do before I can do a pull request hopefully I have some time tomorrow and if someone wants to help, feel free :):

• 2 test randomly fail
• coverage script should be checked/replaced
• check warning circular reference
• docs

https://github.com/Marcelh1983/ngx-chips

[milons]

@Gbuomprisco @Marcelh1983 - can we help you somehow to fix this issue?

[Gbuomprisco]

Hi @milons, @Marcelh1983 the PR is good except the CI file was deleted and therefore the PR cannot be merged yet, I'm waiting for an update and will then will merge

[milons]

@Gbuomprisco are you able to give us a (pre)release date?

[Gbuomprisco]

If the file is back in today I will be able to publish it right away

[Gbuomprisco]

version 2.0.1 has been released! Thanks to @Marcelh1983

[alignsoft]

The 2.0.1 has exacerbated another issue here: #877

Typeahead dropdowns worked in Chrome and Firefox with the 2.0.0.beta-0, but Safari did not. None work with 2.0.1.

[Gbuomprisco]

2.0.2 has been released, but Safari still not working. Closing this one as there's another issue open for that