update book code

eBook/exercises/chapter_14/goroutine_panic.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+)
+
+func tel(ch chan int) {
+	for i := 0; i < 15; i++ {
+		ch <- i
+	}
+}
+
+func main() {
+	var ok = true
+	ch := make(chan int)
+
+	go tel(ch)
+	for ok {
+		i := <-ch
+		fmt.Printf("ok is %t and the counter is at %d\n", ok, i)
+	}
+}