Add support for requestOptions as a method to Poll

[vxsx]

Why

Fixes #112

I'm not sure this is a proper way, but it works. Get / Poll seem to be quite different and sadly I didn't have much time to dig into the source code.

[fabien0102]

Very nice! Thanks for you contribution, just a little edgecase and we are good :)

[fabien0102]

Almost perfect! But you need to use merge from lodash here, so we can add a header without erase these set in the Provider

Example:
https://github.com/contiamo/restful-react/blob/master/src/useGet.tsx#L87

and the associate test:

restful-react/src/useGet.test.tsx

Lines 512 to 533 in eaa37d2

	it("should merge headers with providers", async () => {
	nock("https://my-awesome-api.fake", { reqheaders: { foo: "bar", bar: "foo" } })
	.get("/")
	.reply(200, { oh: "my god 😍" });
	const MyAwesomeComponent = () => {
	const { data, loading } = useGet<{ oh: string }>({ path: "/", requestOptions: { headers: { foo: "bar" } } });
	return loading ? <div data-testid="loading">Loading…</div> : <div data-testid="data">{data.oh}</div>;
	};
	const { getByTestId } = render(
	<RestfulProvider base="https://my-awesome-api.fake" requestOptions={() => ({ headers: { bar: "foo" } })}>
	<MyAwesomeComponent />
	</RestfulProvider>,
	);
	await waitForElement(() => getByTestId("data"));
	expect(getByTestId("data")).toHaveTextContent("my god 😍");
	});
	});

[vxsx]

Right, good catch, thanks!

Fixed and added a test.

[fabien0102]

Good to me! Thank again for this beautiful PR 👌

[TejasQ]

@vxsx, you're a legend. Thanks for your contribution! 🎉