Suggest to use HTTP 200 instead of 304 for the cached response

[ShengChangYang]

Thanks for this great project first.

I would like to use the v3.5.0 to handle the HTTP 304 case, but I got a HTTP 304 (cached) response.
By the RFC 2616, a HTTP 304 response MUST NOT contain a message-body.

dio_cache_interceptor/dio_cache_interceptor/lib/src/model/cache_response.dart

Lines 81 to 89 in c73e895

	Response toResponse(RequestOptions options, {bool fromNetwork = false}) {
	return Response(
	data: deserializeContent(options.responseType, content),
	extra: {cacheKey: key, CacheResponse.fromNetwork: fromNetwork},
	headers: getHeaders(),
	statusCode: 304,
	requestOptions: options,
	);
	}

IMO, I suggest to use HTTP 200 for this case.
Thank you.

[ShengChangYang]

Just found there had the same opinion before.
#141 (comment)