Do no install the package by default

[blink1073]

Fixes #440

[codecov-commenter]

Codecov Report

Base: 81.34% // Head: 81.27% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (0dcd8da) compared to base (96eab80).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #449      +/-   ##
==========================================
- Coverage   81.34%   81.27%   -0.08%     
==========================================
  Files          20       20              
  Lines        2831     2815      -16     
  Branches      366      332      -34     
==========================================
- Hits         2303     2288      -15     
- Misses        395      397       +2     
+ Partials      133      130       -3     

Impacted Files	Coverage Δ
jupyter_releaser/lib.py	80.68% <ø> (+0.86%)	⬆️
jupyter_releaser/tee.py	76.05% <0.00%> (-3.12%)	⬇️
jupyter_releaser/util.py	69.83% <0.00%> (-0.59%)	⬇️
jupyter_releaser/python.py	72.28% <0.00%> (-0.33%)	⬇️
jupyter_releaser/mock_github.py	63.37% <0.00%> (ø)

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