Remove Python 2 support and modernize required libraries.#248

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kmonson wants to merge 7 commits intovallettea:masterfrom

kmonson:python3

Commits on Feb 27, 2020

Bring up to latest versions of libs, many of which are Python 3 only. Remove Python 2 support.
Kyle Monson
committed
Removed six requirement.
Kyle Monson
committed

Commits on Mar 4, 2020

Add sheets list to Spreadsheet object.
Kyle Monson
committed

Commits on Mar 5, 2020

Fix division bug.
Kyle Monson
committed
Fix more devision.
Kyle Monson
committed

Commits on Mar 9, 2020

Fix lxml version.
Kyle Monson
committed
Add numpy-financial requirement.
Kyle Monson
committed