Yfinance

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- Merged PR to allow yfinance to be pickled

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- Merged PRs to fix some bugs
- Added lookup by ISIN ``utils.get_all_by_isin(...)``, ``utils.get_ticker_by_isin(...)``, ``utils.get_info_by_isin(...)``, ``utils.get_news_by_isin(...)``
- ``yf.Ticker``, ``yf.Tickers``, and ``yf.download`` will auto-detect ISINs and convert them to tickers
- Propagating timeout parameter through code, setting request.get(timeout)
- Adds ``Ticker.analysis`` and ``Ticker.get_analysis(...)``

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- Merged PRs to fix some bugs
- Added ``Ticker.stats()`` method
- Added ``Ticker.news`` property
- Providing topHoldings for ETFs
- Replaceed drop duplicate prices with indexes
- Added pre-market price to ``Ticker.info``

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- Duplicates and missing rows cleanup

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- Added UserAgent to all requests (via utils.user_agent_headers)

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- Switched to using query2.finance.yahoo.com, which used HTTP/1.1