added covariance matrix and corrected pseudocount

[pagnani]

No description provided.

[codecov]

Codecov Report

Merging #4 (2048a34) into main (68e9c80) will increase coverage by 2.45%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   73.28%   75.73%   +2.45%     
==========================================
  Files           4        4              
  Lines         146      169      +23     
==========================================
+ Hits          107      128      +21     
- Misses         39       41       +2     

Impacted Files	Coverage Δ
src/CorrDCA.jl	100.00% <ø> (ø)
src/frequencies.jl	94.44% <100.00%> (-2.33%)	⬇️

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