Update documentation

README.md

@@ -14,6 +14,7 @@ This library supports [version 1.18 and later][ver] of Go.
 
 ```go
 import "github.com/cholland1989/go-delay/pkg/delay"
+import "github.com/cholland1989/go-delay/pkg/retry"
 import "github.com/cholland1989/go-delay/pkg/sleep"
 ```
 
@@ -39,8 +40,9 @@ representing 0.5 seconds.
 jitter. For example, `delay.RandomJitter(time.Second, 0.5)` will return a
 `time.Duration` between 0.5 seconds and 1.5 seconds.
 
-Package [`sleep`](https://pkg.go.dev/github.com/cholland1989/go-delay/pkg/sleep)
-provides wrapper functions to simplify the most common use case.
+Package [`retry`](https://pkg.go.dev/github.com/cholland1989/go-delay/pkg/retry)
+and [`sleep`](https://pkg.go.dev/github.com/cholland1989/go-delay/pkg/sleep)
+provide wrapper functions to simplify the most common use cases.
 
 See the [documentation][doc] for more details.
 

pkg/sleep/exponential_backoff.go

@@ -1,5 +1,5 @@
 // Package sleep provides wrapper functions to simplify the most common use
-// case.
+// cases.
 package sleep
 
 import (

pkg/sleep/rate_limit_test.go

@@ -2,14 +2,15 @@ package sleep
 
 import (
 	"context"
+	"io"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/require"
 )
 
 func HealthCheck() error {
-	return context.Canceled
+	return io.EOF
 }
 
 func ExampleRateLimit() {