Build: Install the libxml2-utils package on Travis, it's needed for xmllint

mgol · mgol · commit 077f1bec6a1a · 2018-02-08T22:07:48.000+01:00
Closes jquery#1080
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,7 @@
 language: node_js
 node_js:
   - "8"
+addons:
+  apt:
+    packages:
+    - libxml2-utils
