Remove rtol in Baum-Welch

[gdalle]

Breaking change: replace rtol with atol in baum_welch

Bump version to 0.3.0

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02% ⚠️

Comparison is base (78fb271) 93.16% compared to head (e79e440) 93.15%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
- Coverage   93.16%   93.15%   -0.02%     
==========================================
  Files          19       19              
  Lines         483      482       -1     
==========================================
- Hits          450      449       -1     
  Misses         33       33              

Files Changed	Coverage Δ
src/HiddenMarkovModels.jl	100.00% <100.00%> (ø)
src/inference/baum_welch.jl	90.69% <100.00%> (ø)
src/utils/fit.jl	76.92% <100.00%> (ø)
src/utils/probvec.jl	90.90% <100.00%> (ø)
src/utils/transmat.jl	76.19% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.