Adjust visium spot positions

[ludvb]

No description provided.

[codecov-commenter]

Codecov Report

Merging #8 into master will increase coverage by 0.60%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
+ Coverage   88.91%   89.52%   +0.60%     
==========================================
  Files          76       76              
  Lines        2445     2577     +132     
==========================================
+ Hits         2174     2307     +133     
+ Misses        271      270       -1     

Flag	Coverage Δ
#unittests	89.52% <93.75%> (+0.60%)	⬆️

Impacted Files	Coverage Δ
xfuse/convert/utility.py	93.65% <ø> (+6.34%)	⬆️
xfuse/convert/st.py	62.22% <42.85%> (ø)
xfuse/__main__.py	87.70% <89.47%> (-0.53%)	⬇️
xfuse/convert/visium.py	97.72% <98.26%> (+13.11%)	⬆️

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