.travis.yml: explicitly request Ubuntu trusty

kdudka · kdudka · commit 4e68b4cf975e · 2019-11-05T12:54:21.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,6 @@
 language: cpp
 compiler: gcc
+dist: trusty
 
 before_install:
     - sudo apt-get update
