Fix example and remove false deprecated message (#374)

README.md

@@ -26,6 +26,24 @@ This library requires Go 1.11 or later.
 $ go get -u github.com/line/line-bot-sdk-go/v7/linebot
 ```
 
+## Import all packages in your code ##
+```go
+import (
+    "github.com/line/line-bot-sdk-go/v7/linebot"
+    "github.com/line/line-bot-sdk-go/v7/linebot/channel_access_token"
+    "github.com/line/line-bot-sdk-go/v7/linebot/httphandler"
+    "github.com/line/line-bot-sdk-go/v7/linebot/insight"
+    "github.com/line/line-bot-sdk-go/v7/linebot/liff"
+    "github.com/line/line-bot-sdk-go/v7/linebot/manage_audience"
+    "github.com/line/line-bot-sdk-go/v7/linebot/messaging_api"
+    "github.com/line/line-bot-sdk-go/v7/linebot/module"
+    "github.com/line/line-bot-sdk-go/v7/linebot/module_attach"
+    "github.com/line/line-bot-sdk-go/v7/linebot/shop"
+    "github.com/line/line-bot-sdk-go/v7/linebot/webhook"
+)
+
+```
+
 ## Configuration ##
 
 ```go
@@ -65,7 +83,7 @@ import (
 	"github.com/line/line-bot-sdk-go/v7/linebot/webhook"
 )
 
-cb, err := webhook.ParseRequest(req)
+cb, err := webhook.ParseRequest(os.Getenv("LINE_CHANNEL_SECRET"), req)
 if err != nil {
 	// Handle any errors that occur.
 }
@@ -85,6 +103,16 @@ for _, event := range cb.Events {
 }
 ```
 
+We provide code [examples](./examples).
+- [EchoBot](./examples/echo_bot/server.go)
+  - a simple echo bot
+- [KitchenSink](./examples/kitchensink/server.go)
+  - a bot that handles many types of events
+- [EchoBotHandler](./examples/echo_bot_handler/server.go)
+- [DeliveryHelper](./examples/delivery_helper/main.go)
+- [InsightHelper](./examples/insight_helper/main.go)
+- [RichmenuHelper](./examples/richmenu_helper/main.go)
+
 ### Receiver ###
 
 To send a message to a user, group, or room, you need either an ID

linebot/webhook/parse.go

@@ -15,7 +15,6 @@ var (
 )
 
 // ParseRequest func
-// Deprecated: Use OpenAPI based classes instead.
 func ParseRequest(channelSecret string, r *http.Request) (*CallbackRequest, error) {
 	defer func() { _ = r.Body.Close() }()
 	body, err := io.ReadAll(r.Body)
@@ -33,7 +32,6 @@ func ParseRequest(channelSecret string, r *http.Request) (*CallbackRequest, erro
 	return &cb, nil
 }
 
-// Deprecated: Use OpenAPI based classes instead.
 func ValidateSignature(channelSecret, signature string, body []byte) bool {
 	decoded, err := base64.StdEncoding.DecodeString(signature)
 	if err != nil {