drop the PHP 5.3 from test set the required 5.4+

Author: peter279k

.travis.yml

@@ -1,24 +1,13 @@
 language: php
-matrix:
-  include:
-    - php: 5.3
-      dist: precise
-    - php: 5.4
-      dist: trusty
-    - php: 5.5
-      dist: trusty
-    - php: 5.6
-      dist: trusty
-    - php: 7.0
-      dist: trusty
-    - php: 7.1
-      dist: trusty
-    - php: 7.2
-      dist: trusty
-    - php: nightly
-      dist: trusty
-    - php: hhvm
-      dist: trusty
+php:
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
+  - 7.2
+  - nightly
+  - hhvm
 before_script:
   - composer install
 script: ./vendor/bin/phpunit

composer.json

@@ -11,7 +11,7 @@
     "license": "MIT",
 
     "require": {
-        "php": ">=5.3.0"
+        "php": ">=5.4"
     },
 
     "suggest": {