message: fix: update peer dependencies to start from v8
diff: "dropdown",
  "multiselect",
  "autocomplete",
  - "angular2",
  - "angular4"
  + "angular2"
  ],
  "peerDependencies": {
  - "@angular/common": ">=6.0.0 <9.0.0",
  - "@angular/core": ">=6.0.0 <9.0.0",
  - "@angular/forms": ">=6.0.0 <9.0.0"
  + "@angular/common": ">=8.0.0 <9.0.0",
  + "@angular/core": ">=8.0.0 <9.0.0",
  + "@angular/forms": ">=8.0.0 <9.0.0"
  }
  }
  