backward compatibility

CHANGELOG.md

+## [2.3.0] - 2019-03-25
+### Fixed
+- Backward compatibility
+
 ## [2.3.0] - 2019-03-25
 ### Added
 - Factory

src/Basic_Requirement_Checker.php

@@ -8,6 +8,7 @@ if ( ! interface_exists( 'WPDesk_Requirement_Checker' ) ) {
 	require_once 'Requirement_Checker.php';
 }
 
+if (! class_exists('WPDesk_Basic_Requirement_Checker') ) {
     /**
      * Checks requirements for plugin
      * have to be compatible with PHP 5.2.x
@@ -399,3 +400,4 @@ class WPDesk_Basic_Requirement_Checker implements WPDesk_Translatable, WPDesk_Re
             }
         }
     }
+}
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