FIX: Use openpyxl instead of xlrd
Fixes #29 (closed)
Summary
Removes the dependency on the discontinued xlrd<=1.2, uses xlrd>=2.0 for xls files and openpyxl for xlsx files.
Focus
Apparently we waited long enough so that Pandas fixed their engines for reading xls(x) files when both xlrd and openpyxl are installed. So only added a unittest for xls files and removed the version limitation
Test Environment
Simply do the unittests and the integrationtests with the updated xlrd version.
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