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New features
============
* New parser and automatic downloader for the OECD-ICIO tables (2016 and 2018
release)
* Improved test coverage to over 90 %
* Equality comparison for MRIO System and Extension
Bugfixes
========
* Fixed some typos
Backward incompatible changes
==============================
* Minimum python version changed to 3.7
* The FY and SY matrixes has been renamed to F_Y and S_Y. Previously stored
data, however, can still be read (FY/SY files are automatically parsed as F_Y
and S_Y)
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