Drop support for PHP 5.3

.travis.yml

@@ -5,7 +5,6 @@ language:
   php
 
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.6"
+        "php": ">=5.4"
     },
     "require-dev": {
         "egulias/email-validator": "~1.2",

library/Exceptions/ValidationException.php

@@ -106,12 +106,7 @@ class ValidationException extends InvalidArgumentException implements Validation
             }
         }
 
-        $options = 0;
-        if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
-            $options = (JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
-        }
-
-        return (@json_encode($value, $options) ?: $value);
+        return (@json_encode($value, (JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE)) ?: $value);
     }
 
     /**