Change http-proxy & types into dependencies

[larrifax]

I believe these dependencies needs to lie in the dependencies array so that they're accessible to consumers of your library.

Installing version 1.0.8 yields Typescript errors whenever I try to add any NextHttpProxyMiddlewareOptions originating from @types/http-proxy, e.g.:

import { NextApiRequest, NextApiResponse } from "next";
import proxy from "next-http-proxy-middleware";

const handler = async (req: NextApiRequest, res: NextApiResponse) => {
  return proxy(req, res, {
    target: "http://some-target.url"
  });
};

export default handler;

Error:

Argument of type '{ target: string | undefined; }' is not assignable to parameter of type 'NextHttpProxyMiddlewareOptions'.
  Object literal may only specify known properties, and 'target' does not exist in type 'NextHttpProxyMiddlewareOptions'.

The same version also yields runtime errors, since http-proxy isn't installed: Error: Cannot find module 'http-proxy'.

[stegano]

Hi @larrifax
Thanks for your PR!
I will release the modified code as a hotfix

[stegano]

@all-contributors please add @larrifax for bug

Now released on npm.
Thanks for fixing the bug 😀

[allcontributors]

@stegano

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