Replace the deprecated code

qiuyangnie · web-flow · commit 02c6ead3eff5 · 2019-12-04T10:19:46.000Z
`warning: there was one deprecation warning (since 2.13.0);`
diff --git a/_overviews/scala-book/traits-abstract-mixins.md b/_overviews/scala-book/traits-abstract-mixins.md
@@ -22,7 +22,7 @@ To demonstrate this, here’s a Scala trait that has a concrete method named `sp
 
 ```scala
 trait Pet {
-    def speak { println("Yo") }   // concrete implementation of a speak method
+    def speak = println("Yo")     // concrete implementation of a speak method
     def comeToMaster(): Unit      // abstract
 }
 ```

Original file line number	Diff line number	Diff line change
@@ -22,7 +22,7 @@ To demonstrate this, here’s a Scala trait that has a concrete method named `sp
`22`	`22`
`23`	`23`	```scala
`24`	`24`	`trait Pet {`
`25`		`- def speak { println("Yo") } // concrete implementation of a speak method`
	`25`	`+ def speak = println("Yo") // concrete implementation of a speak method`
`26`	`26`	`def comeToMaster(): Unit // abstract`
`27`	`27`	`}`
`28`	`28`	```