Address travis buildfile warnings. (#177)
Address travis buildfile warnings. (#177)

This fixes #176

Signed-off-by: Sjoerd Talsma <1dafb4c4a7acdc6e1eca32ff35fda03e0e9cd976@talsma-ict.nl>
talsma-ict/concurrency,talsma-ict/context-propagation