chore(package): update cross-env to version 5.2.0

[kremalicious]

closes #181

[codecov-io]

Codecov Report

Merging #200 into master will increase coverage by 1.55%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #200      +/-   ##
==========================================
+ Coverage   84.43%   85.99%   +1.55%     
==========================================
  Files          11       11              
  Lines         257      257              
==========================================
+ Hits          217      221       +4     
+ Misses         40       36       -4

Impacted Files	Coverage Δ
src/baseRequest.js	79.31% <0%> (+6.89%)	⬆️
src/request.js	92.85% <0%> (+14.28%)	⬆️

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