Allow passing our own Dio in order to use Dio Cache interceptor

[atn832]

If I make too many requests to yfinance, it starts returning error 429: Too many requests. My app actually makes a lot of similar requests, so I could solve my issue by using a Dio Cache like this one: https://pub.dev/packages/dio_cache_interceptor. However, the API currently does not allow us to do that. Would you be able to modify the API to optionally provide my own instance of Dio?

yahoo_finance_data_reader/lib/src/daily/services/yahoo_finance_daily_reader.dart

Line 60 in 6e59fa3

final Dio dio = Dio();