fix show matrix

[guimarqu]

close #48

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (ef66de4) 98.14% compared to head (096b9d6) 98.14%.
Report is 1 commits behind head on master.

❗ Current head 096b9d6 differs from pull request most recent head 648eaa4. Consider uploading reports for the commit 648eaa4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
- Coverage   98.14%   98.14%   -0.01%     
==========================================
  Files          12       12              
  Lines        1023     1022       -1     
==========================================
- Hits         1004     1003       -1     
  Misses         19       19              

Files	Coverage Δ
src/matrix.jl	98.78% <100.00%> (-0.02%)	⬇️

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