add some protobuf rendering examples in README, add some tests and update some annotations

README.md

@@ -40,7 +40,7 @@ Gin is a web framework written in Go (Golang). It features a martini-like API wi
     - [Bind Query String or Post Data](#bind-query-string-or-post-data)
     - [Bind HTML checkboxes](#bind-html-checkboxes)
     - [Multipart/Urlencoded binding](#multiparturlencoded-binding)
-    - [XML, JSON and YAML rendering](#xml-json-and-yaml-rendering)
+    - [XML, JSON, YAML and ProtoBuf rendering](#xml-json-yaml-and-protobuf-rendering)
     - [JSONP rendering](#jsonp)
     - [Serving static files](#serving-static-files)
     - [Serving data from reader](#serving-data-from-reader)
@@ -871,7 +871,7 @@ Test it with:
 $ curl -v --form user=user --form password=password http://localhost:8080/login
 ```
 
-### XML, JSON and YAML rendering
+### XML, JSON, YAML and ProtoBuf rendering
 
 ```go
 func main() {
@@ -905,6 +905,18 @@ func main() {
 		c.YAML(http.StatusOK, gin.H{"message": "hey", "status": http.StatusOK})
 	})
 
+	r.GET("/someProtoBuf", func(c *gin.Context) {
+		reps := []int64{int64(1), int64(2)}
+		label := "test"
+
+		// Proto specifically defines the testdata/protoexample file
+		data := &protoexample.Test{
+			Label: &label,
+			Reps:  reps,
+		}
+		c.ProtoBuf(http.StatusOK, data)
+	})
+
 	// Listen and serve on 0.0.0.0:8080
 	r.Run(":8080")
 }

context_test.go

@@ -971,7 +971,7 @@ func TestContextRenderProtoBuf(t *testing.T) {
 		Reps:  reps,
 	}
 
-	c.ProtoBuf(201, data)
+	c.ProtoBuf(http.StatusCreated, data)
 
 	protoData, err := proto.Marshal(data)
 	assert.NoError(t, err)