update book code

eBook/examples/chapter_5/for3.go

@@ -1,15 +1,15 @@
-package main
-
-import "fmt"
-
-func main() {
-	var i int = 5
-
-	for {
-		i = i - 1
-		fmt.Printf("The variable i is now: %d\n", i)
-		if i < 0 {
-			break
-		}
-	}
-}
+package main
+
+import "fmt"
+
+func main() {
+	var i int = 5
+
+	for {
+		i = i - 1
+		fmt.Printf("The variable i is now: %d\n", i)
+		if i < 0 {
+			break
+		}
+	}
+}