update testadded readme, license and travis

Author: Fs02

.travis.yml

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+language: go
+go:
+ - "1.12.x"
+ - "1.13.x"
+ - "1.14.x"
+
+script:
+ - go test -race ./...

LICENSE

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+MIT License
+
+Copyright (c) 2020 Muhammad Surya Asriadie
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# changeset
+
+[![GoDoc](https://godoc.org/github.com/Fs02/changeset?status.svg)](https://godoc.org/github.com/Fs02/changeset) 
+[![Build Status](https://travis-ci.org/Fs02/changeset.svg?branch=master)](https://travis-ci.org/Fs02/changeset) 
+[![Go Report Card](https://goreportcard.com/badge/github.com/Fs02/changeset)](https://goreportcard.com/report/github.com/Fs02/changeset)
+[![Gocover](https://gocover.io/_badge/github.com/Fs02/changeset)](https://gocover.io/github.com/Fs02/changeset)
+
+Changeset mutator for [REL](https://github.com/Fs02/rel). Changesets allow filtering, casting, validation and definition of constraints when manipulating structs.
+
+## Install
+
+```bash
+go get github.com/Fs02/changeset
+```
+
+## Example
+
+```golang
+package main
+
+import (
+"time"
+
+"github.com/Fs02/rel"
+"github.com/Fs02/rel/adapter/mysql"
+"github.com/Fs02/changeset"
+"github.com/Fs02/changeset/params"
+)
+
+type Product struct {
+ID int
+Name string
+Price int
+CreatedAt time.Time
+UpdatedAt time.Time
+}
+
+// ChangeProduct prepares data before database operation.
+// Such as casting value to appropriate types and perform validations.
+func ChangeProduct(product interface{}, params params.Params) *changeset.Changeset {
+ch := changeset.Cast(product, params, []string{"name", "price"})
+changeset.ValidateRequired(ch, []string{"name", "price"})
+changeset.ValidateMin(ch, "price", 100)
+return ch
+}
+
+func main() {
+ // initialize mysql adapter.
+ adapter, _ := mysql.Open(dsn)
+ defer adapter.Close()
+
+ // initialize rel's repo.
+ repo := rel.New(adapter)
+
+var product Product
+
+// Inserting Products.
+// Changeset is used when creating or updating your data.
+ch := ChangeProduct(product, params.Map{
+"name": "shampoo",
+"price": 1000,
+})
+
+if ch.Error() != nil {
+// handle error
+}
+
+// Changeset can also be created directly from json string.
+jsonch := ChangeProduct(product, params.ParseJSON(`{
+"name": "soap",
+"price": 2000,
+}`))
+
+// Create products with changeset and return the result to &product,
+if err := repo.Insert(context.TODO(), &product, ch); err != nil {
+// handle error
+}
+}
+```
+
+## License
+
+Released under the [MIT License](https://github.com/Fs02/grimoire/blob/master/LICENSE)