Update go dependencies

vendor/github.com/imkira/go-interpol/io.go

@@ -0,0 +1,52 @@
+package interpol
+
+import (
+	"bufio"
+	"io"
+	"unicode/utf8"
+)
+
+type runeWriter interface {
+	io.Writer
+	WriteRune(r rune) (int, error)
+}
+
+func templateReader(opts *Options) io.RuneReader {
+	if rr, ok := opts.Template.(io.RuneReader); ok {
+		return rr
+	}
+	return bufio.NewReaderSize(opts.Template, utf8.UTFMax)
+}
+
+func outputWriter(opts *Options) runeWriter {
+	if rw, ok := opts.Output.(runeWriter); ok {
+		return rw
+	}
+	return &simpleRuneWriter{w: opts.Output}
+}
+
+type simpleRuneWriter struct {
+	runeEncoder
+	w io.Writer
+}
+
+func (rw *simpleRuneWriter) Write(b []byte) (int, error) {
+	return rw.w.Write(b)
+}
+
+func (rw *simpleRuneWriter) WriteRune(r rune) (int, error) {
+	return rw.w.Write(rw.encode(r))
+}
+
+type runeEncoder struct {
+	b [utf8.UTFMax]byte
+}
+
+func (re *runeEncoder) encode(r rune) []byte {
+	if r < utf8.RuneSelf {
+		re.b[0] = byte(r)
+		return re.b[:1]
+	}
+	n := utf8.EncodeRune(re.b[:], r)
+	return re.b[:n]
+}