add xsltproc and diff to travis deps

diff --git a/.travis.yml b/.travis.yml
index cd5a315499936a0613c4cea0ec1739b42bde3958..c81a2933de4f995006e345455165fd546fc9942b 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,10 @@
 language: php
 sudo: false
+addons:
+  apt:
+    packages:
+    - diff
+    - xsltproc
 php:
   - 7
   - 5.6