chore: tag v15 [skip ci]

fear(core): add support for Angular v13

Fixes #1345
Fixes ngx-translate/http-loader#101
Fixes ngx-translate/http-loader#100

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

fix(core): remove `semantic-release` from the dependencies

Fixes #1171

fix(npm): downgrade typescript to 3.6.5 for Angular v8 compatibility

Fixes #1168

chore: fix travis install of semantic-release

feat(core): upgrade dependencies for Angular v8+ (#1094)

BREAKING CHANGE: Angular v8+ is now required

fix(TranslateService): compile translations only once (#956)

Fixes #955

docs(README): updating versions table

fix(TranslateStore): export TranslateStore service

Fixes #857