improve valid result, you can set success or error message when valid…

[kuaisheng]

you can return message(success or error) in expression Functions,
like {
result: false,
message: 'input should not include xxxx'
}

[coveralls]

Coverage remained the same at 93.73% when pulling 13068f1 on kuaisheng:master into c5e2603 on huei90:master.

[hueitan]

Thanks and Please also update the following

• Test file
• Grunt build
• API Documentation

[coveralls]

Coverage decreased (-0.1%) to 93.617% when pulling bcf3881 on kuaisheng:master into c5e2603 on huei90:master.

[kuaisheng]

They are completed yet
Thanks

[coveralls]

Coverage decreased (-0.1%) to 93.617% when pulling 73fc9c1 on kuaisheng:master into c5e2603 on huei90:master.

[hueitan]

looks good 👍 Thanks! This is additional feature.