update book code

eBook/exercises/chapter_14/blocking.go

@@ -0,0 +1,19 @@
+// blocking.go
+// throw: all goroutines are asleep - deadlock!
+package main
+
+import (
+	"fmt"
+)
+
+func f1(in chan int) {
+	fmt.Println(<-in)
+}
+
+func main() {
+	out := make(chan int)
+	//out := make(chan int, 1) // solution 2
+	// go f1(out)  // solution 1
+	out <- 2
+	go f1(out)
+}