Thanks to the following people for helping with the tests:
- Hugh Walker: https://lists.ubuntu.com/archives/ubuntu-quality/2017-March/006798.html
- Carla Sella: https://lists.ubuntu.com/archives/ubuntu-quality/2017-March/006809.html
- Fil: https://forum.snapcraft.io/t/call-for-testing-vault/497/2
- Ads20000: https://forum.snapcraft.io/t/call-for-testing-vault/497/5