fix: Do not overwrite node's process object

[gatzjames]

Hey 👋
Had an issue with the process object overwrite and thought to create a PR if it makes sense.

Closes #240

[codecov]

Codecov Report

Merging #241 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
- Coverage   98.72%   98.69%   -0.04%     
==========================================
  Files           2        2              
  Lines         157      153       -4     
  Branches       38       38              
==========================================
- Hits          155      151       -4     
  Misses          2        2              

Impacted Files	Coverage Δ
src/index.js	98.36% <ø> (-0.06%)	⬇️
index.js	98.91% <0.00%> (-0.03%)	⬇️

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[semoal]

This should be tested to avoid another regression with this, actually some of my actual work codebases are broken

[gatzjames]

@semoal not sure how to test this, would probably need to run some e2e test with webpack to make it happen.
Also not sure if this actually fixes the issue correctly? Not very keen with how webpack 5 will work and the reason behind this change tbh.

[mrsteele]

This was actually done as part of the last release (didn't see this PR till just now). Sorry about that.