feat: upgrade to angular 8 (#699)

.travis.yml

LICENSE

README.md

angular.json

circle.yml

karma.conf.js

package-lock.json

package.json

src/app/app.component.spec.ts

src/app/header/header.component.spec.ts

src/app/notyf.toast.ts

src/index.html

src/lib/package.json

src/lib/toastr/toast.component.ts

src/lib/toastr/toastr.service.ts

src/polyfills.ts

tsconfig.app.json

tsconfig.json

tsconfig.spec.json

tslint.json