changed for loop condition

Author: jithset

Diff for: plus_one/plus_one.go

@@ -2,7 +2,7 @@ package plus_one
 
 func plusOne(digits []int) []int {
 	carry := 1
-	for i := len(digits); i >= 0; i++ {
+	for i := len(digits)-1; i >= 0; i-- {
 		sum := carry + digits[i]
 		if sum < 10 {
 			digits[i] = sum