Use realIP

Code was copied from https://github.com/go-chi/chi/blob/master/middleware/realip.go

cmd/web/middleware.go

@@ -20,7 +20,7 @@ func (app *application) recoverPanic(next http.Handler) http.Handler {
 func (app *application) logRequest(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		var (
-			ip     = r.RemoteAddr
+			ip     = realIP(r)
 			proto  = r.Proto
 			method = r.Method
 			uri    = r.URL.RequestURI()