chore: migrate to Go modules

vendor/github.com/segmentio/kafka-go/leavegroup.go

@@ -0,0 +1,42 @@
+package kafka
+
+import "bufio"
+
+type leaveGroupRequestV0 struct {
+	// GroupID holds the unique group identifier
+	GroupID string
+
+	// MemberID assigned by the group coordinator or the zero string if joining
+	// for the first time.
+	MemberID string
+}
+
+func (t leaveGroupRequestV0) size() int32 {
+	return sizeofString(t.GroupID) +
+		sizeofString(t.MemberID)
+}
+
+func (t leaveGroupRequestV0) writeTo(w *bufio.Writer) {
+	writeString(w, t.GroupID)
+	writeString(w, t.MemberID)
+}
+
+type leaveGroupResponseV0 struct {
+	// ErrorCode holds response error code
+	ErrorCode int16
+}
+
+func (t leaveGroupResponseV0) size() int32 {
+	return sizeofInt16(t.ErrorCode)
+}
+
+func (t leaveGroupResponseV0) writeTo(w *bufio.Writer) {
+	writeInt16(w, t.ErrorCode)
+}
+
+func (t *leaveGroupResponseV0) readFrom(r *bufio.Reader, size int) (remain int, err error) {
+	if remain, err = readInt16(r, size, &t.ErrorCode); err != nil {
+		return
+	}
+	return
+}