The fix to enable changing type of a column

Ran into bug with migration:

 public function change()
    {
        $table = $this->table('user_properties');
        $table
            ->changeColumn('birth', 'date', ['default' => '1930-01-01'])
            ->update();
    }

 [PDOException]                                                              
  SQLSTATE[42601]: Syntax error: 7 ERROR:  syntax error at or near "NULL"     
  LINE 1: ...."user_properties" ALTER COLUMN "birth" TYPE DATE NULL DEFAU...