Stricter isNode check

[zigomir]

Hi!

I tried running uvu with vite and because vite injects env on to window.process, uvu would fail for me at process.argv.some().

Other front end tools also sometimes override process so that client code can grab ENV variables.

Thanks for creating uvu, it's great!

[codecov-io]

Codecov Report

Merging #63 (5780b72) into master (0f9dfb7) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #63   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files           3        3           
  Lines         297      297           
=======================================
  Hits          267      267           
  Misses         30       30           

Impacted Files	Coverage Δ
src/index.js	76.28% <100.00%> (ø)

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[lukeed]

Hey, thank you :)

I updated it a bit so that it's more inline with the underlying kleur check for Node: lukeed/kleur#42

Nearly everything that polyfills process doesnt polyfill process.stdout – so this should close #53 too