Quandl-fund-xlsx

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* Add support for the MRQ and ARQ dimensions.
* Correct error in calculating CAGR when the data was given in quarterly increments.
* Correctly reference the Excel spreadsheet example figures in the README.

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* Minor security fix, requests version now >=2.20.0
* Minor documentation cleanup

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* After learning that the sample data API now allows _all_ of the same
indicators as those available using the paid SF! aPI key I was able to
remove a lot of special case code for the Sample data KEY.
The paid KEY allows for many more dimensions to be queried.
* The CLI now defaults back to using the sample data SF0 API key.
* Added a number of Cash Flow from Operations based metrics as well as some
Free Cash Flow based metrics.
* Added a development test which uses the API and a sample data or SF0 API key
to extract ratios for AAPL.
* Added Excess Cash Margin ratio.

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* Added some new Cash Flow related ratios and corrected the LTDEBT ratios
* Changed the default to be the paid SF1 Database as this is the one I'm using
and testing. Requires a separate free SF0 subscription to test SFO. All of
the API calls whether the user has an SFI paid membership or SF0 use the
SF1 codes.

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* Added back support for the --dimension CLI option.

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* Fix bug where the SF0 subscription data was not being returned.
* With the discontinuation of the Sharadar Time series API at the end of March
2018, the codes for the free fundamental subscription SF0 database changed.
Subscribers to the SF0 data now use the SHARADAR/SF1 code in the get_table
accesses.