Merge pull request #87 from kasperg/fix-php-53-build

Fix builds on PHP 5.3 (and also run tests on PHP 7.2)

Author: mtibben

.travis.yml

@@ -1,14 +1,16 @@
 language: php
-php:
-  - 5.3
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-  - 7.1
-  - hhvm
 
 matrix:
+  include:
+    - php: 5.3
+      dist: precise
+    - php: 5.4
+    - php: 5.5
+    - php: 5.6
+    - php: 7.0
+    - php: 7.1
+    - php: 7.2
+    - php: hhvm
   allow_failures:
     - php: hhvm