Add "dist: trusty" to allow PHP 5.5 in Travis CI

vearutop · vearutop · commit 673d27fca24a · 2019-08-19T10:15:59.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -9,6 +9,7 @@ php:
   - 5.5
 
 sudo: false
+dist: trusty
 
 ## Cache composer bits
 cache:
