8.3.20

Upgrade to Angular CLI 8.3.20

7.3.9

Upgrade to Node 10 and Angular CLI 7.3.9

6.2.2-slim

Switch to slim image variant, which is now also debian:strech based s…

…o has latest Chromium available.

6.2.2

Switch to stretch base image to have latest Chromium available. This …

…sadly bumps up the image size.