doc: add code play

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        redis-version: [6, 7]
+        redis-version: [7]
     steps:
     - uses: actions/checkout@v2
     - name: Start Redis

readme.md

@@ -64,6 +64,7 @@ Refer to: [examples](https://github.com/ahuigo/gofnext/blob/main/examples)
 
 ### Cache fibonacii function
 Refer to: [decorator fib example](https://github.com/ahuigo/gofnext/blob/main/examples/decorator-fib_test.go)
+> Play: https://go.dev/play/p/7BCINKENJzA
 
 ```go
 package main

readme.zh.md

@@ -63,6 +63,8 @@
 ### 缓存斐波那契函数
 参考：[装饰器斐波那契示例](https://github.com/ahuigo/gofnext/blob/main/examples/decorator-fib_test.go)
 
+> Play: https://go.dev/play/p/7BCINKENJzA
+
 ```go
 package main
 import "fmt"

serial/load_test.go

@@ -11,7 +11,7 @@ func almostEqual(a, b float64) bool {
 	return math.Abs(a-b) <= float64EqualityThreshold
 }
 
-func TestLoad(t *testing.T) {
+func TestLoadBase(t *testing.T) {
 	var f float64
 	Load([]byte(`-3.14`), &f)
 	expectedFloat := -3.14
@@ -26,11 +26,6 @@ func TestLoad(t *testing.T) {
 	if str != expected {
 		t.Errorf("got %q, want %q", str, expected)
 	}
-	data = []byte(`"Hello, World!`)
-	err := Load(data, &str)
-	if err == nil {
-		t.Errorf("should be error, but get nil")
-	}
 
 	var i int
 	Load([]byte(`-42`), &i)