Document PHP 5.6 support

Author: thekid

README.md

@@ -4,6 +4,7 @@ Is operator for PHP
 [![Build Status on TravisCI](https://secure.travis-ci.org/xp-lang/php-is-operator.svg)](http://travis-ci.org/xp-lang/php-is-operator)
 [![XP Framework Module](https://raw.githubusercontent.com/xp-framework/web/master/static/xp-framework-badge.png)](https://github.com/xp-framework/core)
 [![BSD Licence](https://raw.githubusercontent.com/xp-framework/web/master/static/licence-bsd.png)](https://github.com/xp-framework/core/blob/master/LICENCE.md)
+[![Required PHP 5.6+](https://raw.githubusercontent.com/xp-framework/web/master/static/php-5_6plus.png)](http://php.net/)
 [![Supports PHP 7.0+](https://raw.githubusercontent.com/xp-framework/web/master/static/php-7_0plus.png)](http://php.net/)
 [![Latest Stable Version](https://poser.pugx.org/xp-lang/php-is-operator/version.png)](https://packagist.org/packages/xp-lang/php-is-operator)
 

composer.json

@@ -6,9 +6,9 @@
   "description" : "Is operator for PHP",
   "keywords": ["language", "module", "xp"],
   "require" : {
-    "xp-framework/core": "^9.0 | ^8.0",
+    "xp-framework/core": "^9.0 | ^8.0 | ^7.0",
     "xp-framework/compiler": "dev-master as 4.0.0",
-    "php" : ">=7.0.0"
+    "php" : ">=5.6.0"
   },
   "require-dev" : {
     "xp-framework/unittest": "^9.0 | ^8.0"