try building on older travis image

richard-ejem · richard-ejem · commit 4b74b5514ad3 · 2018-02-06T14:18:21.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,10 @@ language: php
 
 php: [5.5,5.6,7.0]
 
+sudo: required
+dist: trusty
+group: deprecated-2017Q4
+
 env:
   - SF_VERSION='~3.1.0'
   - SF_VERSION='~3.2.0'
