The actix_lambda_http from yvt

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thread 'main' panicked at 'no Task is currently running'

Hi, thank you for your excellent package.
I experienced panic when using this with async handlers.

Here is a minimal example.

#[macro_use]
extern crate serde_derive;
#[macro_use]
extern crate log;
extern crate simple_logger;

use actix_lambda_http;
use actix_web::{web, App, Error, HttpResponse};
use futures::future::{ok, Future};
use hyper::{Client, Uri};
use lambda_http::{lambda, IntoResponse, Request, RequestExt, Response};
use lambda_runtime::error::HandlerError;
use lambda_runtime::Context;
use tokio;
use tokio::prelude::AsyncWrite;
use tokio::runtime::Runtime;

fn async_index() -> Box<dyn Future<Item = String, Error = Error>> {
    let client = Client::new();
    let fut = client
        .get(Uri::from_static("http://httpbin.org/ip"))
        .map(|res| {
            format!("status: {}, body: {:?}", res.status(), res.body())
        })
        .map_err(|err| eprintln!("IO error: {:?}", err));
    Box::new(fut.from_err())
}

fn main() {
    env_logger::init();

    actix_lambda_http::LambdaHttpServer::new(|| {
        App::new()
            .wrap(actix_web::middleware::Logger::default())
            .service(
                web::scope("/test-rust")
                    .route("/", web::to_async(async_index)),
            )
    })
    .binary_media_types(vec!["image/png"])
    .start()
    .unwrap();
}