Yfinance

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- Misc bugfixs

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- Added Tickers(…).news()
- Return empty DF if YF missing earnings dates
- Fix EPS % to 0->1
- Fix timezone handling
- Fix handling of missing data
- Clean&format earnings_dates table
- Add ``.get_earnings_dates()`` to retreive earnings calendar
- Added ``.get_earnings_history()`` to fetch earnings data

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- Bug fixed - Closes 937

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- Bug fixed - 920

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- Upgraded requests dependency
- Removed Python 3.5 support

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- Added legal disclaimers to make sure people are aware that this library is not affiliated, endorsed, or vetted by Yahoo, Inc.