fix minor bug

Signed-off-by: Rohit Yadav <rohit@apache.org>

vendor/github.com/chzyer/readline/complete.go

diff --git a/vendor/github.com/chzyer/readline/complete.go b/vendor/github.com/chzyer/readline/complete.go
index 7a6b73a..9d19fa5 100644
--- a/vendor/github.com/chzyer/readline/complete.go
+++ b/vendor/github.com/chzyer/readline/complete.go
@@ -47,7 +47,7 @@
 }
 
 func (o *opCompleter) writeRunes(candidate []rune) {
-	lastIndex := 0
+	lastIndex := len(candidate)
 	for idx, r := range candidate {
 		if r == '(' {
 			lastIndex = idx