Update echo (#82)

vendor/github.com/labstack/echo/v4/response.go

@@ -67,7 +67,10 @@ func (r *Response) WriteHeader(code int) {
 // Write writes the data to the connection as part of an HTTP reply.
 func (r *Response) Write(b []byte) (n int, err error) {
 	if !r.Committed {
-		r.WriteHeader(http.StatusOK)
+		if r.Status == 0 {
+			r.Status = http.StatusOK
+		}
+		r.WriteHeader(r.Status)
 	}
 	n, err = r.Writer.Write(b)
 	r.Size += int64(n)