Update to Angular 8

[mbeckenbach]

We analyzed your package.json, there are some packages to update:

  Name                               Version                  Command to update
 --------------------------------------------------------------------------------
  @angular/cli                       6.1.5 -> 8.3.19          ng update @angular/cli
  @angular/core                      6.1.6 -> 8.2.14          ng update @angular/core
  @angular/core                      6.1.6 -> 7.2.15          ng update @angular/core
  rxjs                               6.3.0 -> 6.5.3           ng update rxjs