v1.1.5

1. 新增部分标志全称 - *, O and O!

\* - required
O - optional
O! - unset_required

2. 新增错误信息格式

// 例如
"id" => [
    // rule
    'required|int',
    // error message for each method
    'error_message' => [
        'required' => 'It is request field',
        'int' => 'Must be integer',
    ]
]