Merge pull request #3711 from miketon/main

Update loop to Result: 10

listings/ch16-fearless-concurrency/listing-16-15/src/main.rs

@@ -5,7 +5,7 @@ fn main() {
     let counter = Arc::new(Mutex::new(0));
     let mut handles = vec![];
 
-    for _ in 0..10 {
+    for _ in 0..=10 {
         let counter = Arc::clone(&counter);
         let handle = thread::spawn(move || {
             let mut num = counter.lock().unwrap();