v2 is compiling now

Signed-off-by: Vishal Rana <vr@labstack.com>

engine/fasthttp/response.go

@@ -0,0 +1,40 @@
+package fasthttp
+
+import (
+	"github.com/labstack/echo/engine"
+	"github.com/valyala/fasthttp"
+)
+
+type (
+	Response struct {
+		context   *fasthttp.RequestCtx
+		header    engine.Header
+		status    int
+		size      int64
+		committed bool
+	}
+)
+
+func (r *Response) Header() engine.Header {
+	return r.header
+}
+
+func (r *Response) WriteHeader(code int) {
+	r.context.SetStatusCode(code)
+}
+
+func (r *Response) Write(b []byte) (int, error) {
+	return r.context.Write(b)
+}
+
+func (r *Response) Status() int {
+	return r.status
+}
+
+func (r *Response) Size() int64 {
+	return r.size
+}
+
+func (r *Response) Committed() bool {
+	return r.committed
+}