validator.go

package main

import (
    "gopkg.in/bluesuncorp/validator.v5"
    "log"
)

type MyStruct struct {
    StringField string `validate:"required"`
    BoolField   bool   `validate:"required"`
}

func main() {
    validate := validator.New("validate", validator.BakedInValidators)

    myStruct := MyStruct{
        StringField: "some string",
        BoolField:   false,
    }

    errs := validate.Struct(myStruct)
    log.Println(errs)
}

It's not really documented anywhere, but the "required" should not be added to a boolean field.
go's boolean is not tristate, because of that it is always set and so "required" is not really necessary

package main

import (
    "gopkg.in/bluesuncorp/validator.v5"
    "log"
)

type MyStruct struct {
    StringField string `validate:"required"`
    BoolField   bool
}

func main() {
    validate := validator.New("validate", validator.BakedInValidators)

    myStruct := MyStruct{
        StringField: "some string",
        BoolField:   false,
    }

    errs := validate.Struct(myStruct)
    log.Println(errs)
}