Remove 5.3 from build matrix

Author: Jamie Hannaford

.travis.yml

@@ -3,7 +3,6 @@ php:
   - "5.6"
   - "5.5"
   - "5.4"
-  - "5.3"
   - hhvm
 
 sudo: false
@@ -33,4 +32,4 @@ notifications:
     - [email protected]
 
 env:
-  - secure: "bdrUeYb3nSGgBB+QtDZxUHVPw6B/wjb3KXLm8TgonWrQm4GPeWKK29qhmDnFZmQjwQPfuebe7wAk1ZxGoZKbEiELVpJJ+8XYVOt6W/6V53H31JL6FqiIE5+7qBwDe+9ziveM6GcTXHT1GI5mUeACIbeBDPZaNubIJH3U6MPim64="
+  - secure: "bdrUeYb3nSGgBB+QtDZxUHVPw6B/wjb3KXLm8TgonWrQm4GPeWKK29qhmDnFZmQjwQPfuebe7wAk1ZxGoZKbEiELVpJJ+8XYVOt6W/6V53H31JL6FqiIE5+7qBwDe+9ziveM6GcTXHT1GI5mUeACIbeBDPZaNubIJH3U6MPim64="