Angular v5 support

Update package dependencies to support angular v5+
```
npm WARN angular-spinners@5.0.4 requires a peer of @angular/core@^2.4.0 || ^4.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN angular-spinners@5.0.4 requires a peer of @angular/common@^2.4.0 || ^4.0.0 but none is installed. You must install peer dependencies yourself.
```
