Merge pull request #401 from s7v7nislands/fix_print

using fmt.Printf instead of fmt.Println

en/02.6.md

@@ -271,7 +271,7 @@ Let's use an example to see more clearly.
 			} else if value, ok := element.(Person); ok {
 				fmt.Printf("list[%d] is a Person and its value is %s\n", index, value)
 			} else {
-				fmt.Println("list[%d] is of a different type", index)
+				fmt.Printf("list[%d] is of a different type\n", index)
 			}
 		}
 	}