Update to renderer interface

Now that we're using channels to communicate beween our
protocol incoming requests and renderer, we can drop the
interface methods.

Author: aaronvb

pkg/renderer/renderer.go

@@ -1,21 +1,13 @@
 package renderer
 
 import (
-	"github.com/aaronvb/logrequest"
+	"sync"
+
+	"github.com/aaronvb/request_hole/pkg/protocol"
 )
 
 // Renderer contains the interface which our servers use to render the output.
 type Renderer interface {
 	// Start is called when we start our server.
-	Start()
-
-	// Fatal is used when we need to display a message and should always exit the CLI.
-	Fatal(error)
-
-	// IncomingRequest is called when we receive an incoming request to the server.
-	IncomingRequest(logrequest.RequestFields, string)
-
-	// IncomingRequestHeaders is called when the details flag is passed and we want to
-	// render the headers.
-	IncomingRequestHeaders(map[string][]string)
+	Start(*sync.WaitGroup, chan protocol.RequestPayload, chan int)
 }