[gh-214] Remove the 3.8 build (only on 16.04, which is no longe available) and the 13 build (not available yet).
[gh-214] Remove the 3.8 build (only on 16.04, which is no longe available) and the 13 build (not available yet).

tomhrr/dale,tomhrr/dale,tomhrr/dale,tomhrr/dale