Removed php5.3 in travis file

Author: mmoreram

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-    - 5.3
     - 5.4
     - 5.5
     - 5.6
@@ -16,4 +15,4 @@ install: composer install --prefer-source --no-interaction
 script: phpunit -c phpunit.xml.dist --coverage-text
 
 notifications:
-    email: false
+    email: false