Fix Travis build for 5.3 using dist: precise

Author: Jean85

.travis.yml

@@ -2,7 +2,6 @@ language: php
 sudo: false
 
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6
@@ -12,8 +11,11 @@ php:
 
 matrix:
   include:
+    - php: 5.3
+      dist: precise
     - php: 5.3
       env: COMPOSER_OPTIONS="--prefer-lowest"
+      dist: precise
     - php: 7.0
       env: COMPOSER_OPTIONS="--prefer-lowest"
     - php: 7.1