feat(core): update dependencies to Angular v10

BREAKING CHANGE: ngx-translate is now built for Angular 10, if you use Angular 9 or below please refer to the [compatibility table](https://github.com/ngx-translate/core#installation) to know which version you can install

Fixes #1225

Author: ocombe

README.md

@@ -49,6 +49,8 @@ Choose the version corresponding to your Angular version:
 
  Angular     | @ngx-translate/core | @ngx-translate/http-loader
  ----------- | ------------------- | --------------------------
+ 10          | 13.x+               | 6.x+
+ 9           | 12.x+               | 5.x+
  8           | 12.x+               | 4.x+
  7           | 11.x+               | 4.x+
  6           | 10.x                | 3.x