fix zendframework#23 missing method in HashTiming (RandomLib 1.2)

Author: remicollet

Source/HashTiming.php

@@ -61,6 +61,17 @@ public static function getStrength()
         return new Strength(Strength::VERYLOW);
     }
 
+    /**
+     * If the source is currently available.
+     * Reasons might be because the library is not installed
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return true;
+    }
+
     /**
      * Generate a random string of the specified size
      *