php denpendancy update( > 5.4)

Author: lesstif

composer.json

@@ -4,7 +4,7 @@
      "type": "library",
     "keywords": ["jira", "jira-php", "jira-rest"],
     "require": {
-        "php": ">=5.3.1",
+        "php": ">=5.4.0",
         "netresearch/jsonmapper": "0.4.*",
         "monolog/monolog": "~1.12"
     },