Improve coverage

[jvivian]

Fixes #31

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (19be5a3) 77.2% compared to head (bf5591e) 90.5%.

Files	Patch %	Lines
covid19_drdfm/dfm.py	92.3%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #32      +/-   ##
========================================
+ Coverage   77.2%   90.5%   +13.3%     
========================================
  Files          5       5              
  Lines        180     159      -21     
  Branches      34      29       -5     
========================================
+ Hits         139     144       +5     
+ Misses        40      14      -26     
  Partials       1       1              

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