http: Fixes for Gin http receiver sample

Fixes for prematurely closed cloudevents#842 PR. Applied all suggested code and doc
changes..

samples/http/receiver-gin/README.md

@@ -8,8 +8,7 @@ An example of a Gin webframework CloudEvents receiver with a [TektonEvent](https
 Get dependencies
 ```shell
 cd samples/
- go get github.com/gin-gonic/gin
- go get github.com/rs/zerolog/log
+ go get
 
 ```
 
@@ -18,11 +17,11 @@ Run the app
  go run main.go
 ```
 
-Test a CloudEvent
+Send a CloudEvent
 ```shell
 curl -v \
  -H "Ce-Id: e7d95c20-6eb4-4614-946d-27b0ce41c7ff" \
- -H "Ce-Source: /apis///namespaces/dimitar//clone-build-n4qhgl" \
+ -H "Ce-Source: /apis/namespaces/dimitar/clone-build-n4qhgl" \
  -H "Ce-Subject: clone-build-n4qhgl"  \
  -H "Ce-Specversion: 1.0" \
  -H "Ce-Type: dev.tekton.event.pipelinerun.started.v1" \

samples/http/receiver-gin/main.go

@@ -10,7 +10,7 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-func receiveTektonEvent(event cloudevents.Event) {
+func receive(event cloudevents.Event) {
 	fmt.Printf("Got an Event: %s", event)
 }
 
@@ -23,7 +23,6 @@ func healthz(c *gin.Context) {
 }
 
 func cloudEventsHandler() gin.HandlerFunc {
-
 	return func(c *gin.Context) {
 		p, err := cloudevents.NewHTTP()
 		if err != nil {
@@ -32,7 +31,7 @@ func cloudEventsHandler() gin.HandlerFunc {
 				Msg("Failed to create protocol")
 		}
 
-		ceh, err := cloudevents.NewHTTPReceiveHandler(c, p, receiveTektonEvent)
+		ceh, err := cloudevents.NewHTTPReceiveHandler(c, p, receive)
 		if err != nil {
 			log.Fatal().
 				Err(err).
@@ -44,7 +43,6 @@ func cloudEventsHandler() gin.HandlerFunc {
 }
 
 func main() {
-
 	r := gin.Default()
 	r.SetTrustedProxies(nil)