Fix module path for lookup in registry transformer

[agubler]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

The separator for module path should always be / regardless of the platform it is run on.

[codecov]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #45   +/-   ##
=======================================
  Coverage   96.24%   96.24%           
=======================================
  Files          17       17           
  Lines         506      506           
  Branches      121      121           
=======================================
  Hits          487      487           
  Misses          7        7           
  Partials       12       12

Impacted Files	Coverage Δ
src/registry-transformer/index.ts	95.65% <100%> (ø)	⬆️

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