Merge pull request #122 from wp-cli/travis_precise

Update Travis to use precise for PHP 5.3.

Author: miya0001

.travis.yml

@@ -1,13 +1,20 @@
+sudo: false
+dist: trusty
+
 language: php
 
 php:
-    - 5.3
     - 5.4
     - 5.5
     - 5.6
     - 7.0
     - 7.1
 
+matrix:
+  include:
+    - dist: precise
+      php: 5.3
+
 before_script:
   - php -m
   - php --info | grep -i 'intl\|icu\|pcre'