build: fix demo and release v6.0.0

fix: accidental breaking change

build: add missing files to npm

chore: release 5.0.0

chore: bump to Angular 10 and fix build errors in Node 12

fix: error with service in aot

Fixes an error with the `RoundProgressService` in AoT mode.

feat: update to Angular 8 and general cleanup

feat: bump to Angular 6 and change defaults provider

chore: bump to 1.2.1 and lock down typescript version

chore: bump to angular 5.0.0