Properly install NPM Packages

[jtpio]

Follows the same pattern as python packages, part of the work to add releaser to Lumino

[blink1073]

Thank you!

[codecov-commenter]

Codecov Report

Merging #31 (1e2355f) into master (9129099) will decrease coverage by 0.12%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   88.51%   88.38%   -0.13%     
==========================================
  Files          15       15              
  Lines        1715     1722       +7     
  Branches      205      208       +3     
==========================================
+ Hits         1518     1522       +4     
- Misses        122      124       +2     
- Partials       75       76       +1     

Impacted Files	Coverage Δ
jupyter_releaser/lib.py	75.89% <62.50%> (-0.48%)	⬇️
jupyter_releaser/__init__.py	100.00% <100.00%> (ø)
jupyter_releaser/util.py	85.00% <100.00%> (+0.10%)	⬆️

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