update private field opt-in comment

Author: Dean Karn

README.md

@@ -1,7 +1,7 @@
 Package validator
 =================
 <img align="right" src="logo.png">[![Join the chat at https://gitter.im/go-playground/validator](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/go-playground/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-![Project status](https://img.shields.io/badge/version-10.18.0-green.svg)
+![Project status](https://img.shields.io/badge/version-10.19.0-green.svg)
 [![Build Status](https://travis-ci.org/go-playground/validator.svg?branch=master)](https://travis-ci.org/go-playground/validator)
 [![Coverage Status](https://coveralls.io/repos/go-playground/validator/badge.svg?branch=master&service=github)](https://coveralls.io/github/go-playground/validator?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/go-playground/validator)](https://goreportcard.com/report/github.com/go-playground/validator)

options.go

@@ -15,9 +15,10 @@ func WithRequiredStructEnabled() Option {
 	}
 }
 
-// WithPrivateFieldValidation activates validation for unexported fields
+// WithPrivateFieldValidation activates validation for unexported fields via the use of the `unsafe` package.
 //
-// It's experimental feature that partially uses unsafe package
+// By opting into this feature you are acknowledging that you are aware of the risks and accept any current or future
+// consequences of using this feature.
 func WithPrivateFieldValidation() Option {
 	return func(v *Validate) {
 		v.privateFieldValidation = true