Lock Travis distro so new future defaults will not break the build

clue · clue · commit 72a24354c3e2 · 2017-08-04T16:54:48.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,9 @@ php:
   - 7.0
   - 7.1
 
+# lock distro so new future defaults will not break the build
+dist: precise
+
 # also test against HHVM, but require "trusty" and ignore errors
 matrix:
   include:
