Select trusty containers explicitly for Travis builds.

pmcnr-hx · pmcnr-hx · commit c8100b4ab471 · 2017-09-23T12:48:07.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,5 @@
+dist: trusty
+sudo: false
 language: node_js
 services:
   - mongodb
