Fix CI builds

LeoColomb · mathiasbynens · commit 208946aedfb0 · 2017-09-18T13:45:49.000+02:00
Closes #115.
diff --git a/.travis.yml b/.travis.yml
@@ -22,6 +22,8 @@ git:
 
 language: node_js
 
+dist: precise
+
 matrix:
   include:
 
