Add PHP 7.1

Author: thekid

.travis.yml

@@ -8,8 +8,13 @@ php:
   - 5.5
   - 5.6
   - 7.0
+  - 7.1
   - hhvm
 
+matrix:
+  allow_failures:
+    - php: nightly
+
 before_script:
   - wget 'https://github.com/xp-framework/xp-runners/releases/download/v6.3.0/setup' -O - | php
   - composer install --prefer-dist