migrate go version to 1.17 (#203)

* migrate go version to 1.17

* update contributing

vendor/github.com/goccy/go-json/option.go

@@ -1,15 +1,46 @@
 package json
 
-type EncodeOptionFunc func(EncodeOption) EncodeOption
+import (
+	"github.com/goccy/go-json/internal/decoder"
+	"github.com/goccy/go-json/internal/encoder"
+)
 
-func UnorderedMap() func(EncodeOption) EncodeOption {
-	return func(opt EncodeOption) EncodeOption {
-		return opt | EncodeOptionUnorderedMap
+type EncodeOption = encoder.Option
+type EncodeOptionFunc func(*EncodeOption)
+
+// UnorderedMap doesn't sort when encoding map type.
+func UnorderedMap() EncodeOptionFunc {
+	return func(opt *EncodeOption) {
+		opt.Flag |= encoder.UnorderedMapOption
 	}
 }
 
-func Debug() func(EncodeOption) EncodeOption {
-	return func(opt EncodeOption) EncodeOption {
-		return opt | EncodeOptionDebug
+// Debug outputs debug information when panic occurs during encoding.
+func Debug() EncodeOptionFunc {
+	return func(opt *EncodeOption) {
+		opt.Flag |= encoder.DebugOption
+	}
+}
+
+// Colorize add an identifier for coloring to the string of the encoded result.
+func Colorize(scheme *ColorScheme) EncodeOptionFunc {
+	return func(opt *EncodeOption) {
+		opt.Flag |= encoder.ColorizeOption
+		opt.ColorScheme = scheme
+	}
+}
+
+type DecodeOption = decoder.Option
+type DecodeOptionFunc func(*DecodeOption)
+
+// DecodeFieldPriorityFirstWin
+// in the default behavior, go-json, like encoding/json,
+// will reflect the result of the last evaluation when a field with the same name exists.
+// This option allow you to change this behavior.
+// this option reflects the result of the first evaluation if a field with the same name exists.
+// This behavior has a performance advantage as it allows the subsequent strings to be skipped if all fields have been evaluated.
+func DecodeFieldPriorityFirstWin() DecodeOptionFunc {
+	return func(opt *DecodeOption) {
+		opt.Flags |= decoder.FirstWinOption
 	}
 }