- Fixed some missing operators in Having query

src/Query/Having.php

@@ -106,7 +106,7 @@ class Having extends Fragment {
                 }
 
                 # whitelisting operators
-                return in_array(strtoupper($this->operator), [ '=', '!=', '<>', 'LIKE' ]) ? $this->operator : "=";
+                return in_array(strtoupper($this->operator), [ '=', '!=', '>', '>=', '<', '<=', '<>', 'LIKE', 'IS', 'IS NOT', 'REGEXP', 'IN' ]) ? $this->operator : "=";
             }
 
             protected function value()