Use XLSX.jl instead of ExcelReaders.jl

[davidanthoff]

No description provided.

[codecov]

Codecov Report

Merging #13 (a4406e2) into master (49235ed) will not change coverage.
The diff coverage is 75.00%.

@@           Coverage Diff           @@
##           master      #13   +/-   ##
=======================================
  Coverage   60.82%   60.82%           
=======================================
  Files          12       12           
  Lines         217      217           
=======================================
  Hits          132      132           
  Misses         85       85           

Flag	Coverage Δ
unittests	60.82% <75.00%> (ø)

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Impacted Files	Coverage Δ
src/MimiDICE2013.jl	87.09% <ø> (ø)
src/parameters.jl	48.93% <50.00%> (ø)
src/helpers.jl	68.75% <100.00%> (ø)

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