Release v2.8.2 

Release v2.8.1 

update some format 

Merge pull request inhere#26 from xingshuwangluo/master 增加 闭包验证类 功能

fix file validator not work (inhere#25) fix file validator not work

Merge pull request inhere#24 from consatan/fix/each_required_other_way fix#21 each required not work other way

Merge pull request inhere#14 from consatan/fix/multiple_rules_in_fiel… …d_valdation fix: 一条规则多个验证器时验证结果错误

update readme 

new version 

add more tests for filter methods