only upload coverage once

[creisle]

• to avoid the code-cov timeouts that require you to rerun the build, only upload the coverage once instead of once per python version being tested in the matrix

[codecov[bot]]

Codecov Report

Merging #224 into develop will increase coverage by 10.63%. The diff coverage is n/a.

@@             Coverage Diff              @@
##           develop     #224       +/-   ##
============================================
+ Coverage    80.55%   91.18%   +10.63%     
============================================
  Files           52       52               
  Lines         9126     9123        -3     
============================================
+ Hits          7351     8319      +968     
+ Misses        1775      804      -971     

Flag	Coverage Δ
#unittests	91.18% <ø> (+10.63%)	:arrow_up:

Impacted Files	Coverage Δ
mavis/annotate/base.py	87.31% <0.00%> (-0.19%)	:arrow_down:
mavis/illustrate/util.py	92.06% <0.00%> (-0.05%)	:arrow_down:
mavis/annotate/fusion.py	96.02% <0.00%> (+0.33%)	:arrow_up:
mavis/breakpoint.py	94.61% <0.00%> (+0.38%)	:arrow_up:
mavis/bam/cigar.py	98.14% <0.00%> (+0.61%)	:arrow_up:
mavis/schedule/job.py	78.26% <0.00%> (+0.72%)	:arrow_up:
mavis/cluster/main.py	90.24% <0.00%> (+0.81%)	:arrow_up:
mavis/annotate/genomic.py	93.12% <0.00%> (+1.03%)	:arrow_up:
mavis/blat.py	90.27% <0.00%> (+1.38%)	:arrow_up:
mavis/illustrate/elements.py	96.37% <0.00%> (+1.69%)	:arrow_up:
... and 17 more

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