fix: do not read credentials file in webpack override scenario

[esminerva]

Related to: watson-developer-cloud/node-sdk#865

[codecov]

Codecov Report

Merging #19 into master will increase coverage by 0.55%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage    95.6%   96.15%   +0.55%     
==========================================
  Files           7        7              
  Lines         341      416      +75     
  Branches       56      124      +68     
==========================================
+ Hits          326      400      +74     
- Misses         13       15       +2     
+ Partials        2        1       -1

Impacted Files	Coverage Δ
lib/read-credentials-file.ts	93.1% <100%> (+2.62%)	⬆️
lib/helper.ts	100% <0%> (ø)	⬆️
iam-token-manager/v1.ts	100% <0%> (ø)	⬆️
lib/requestwrapper.ts	100% <0%> (ø)	⬆️
lib/base_service.ts	89.51% <0%> (+1.63%)	⬆️
lib/content-type.ts	91.66% <0%> (+1.66%)	⬆️

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[germanattanasio]

I think this will work but we need to test it.
There is an example in the examples folder. If that works when you load it from a browser then we can merge this.

[esminerva]

I need to add unit test still too.

[dpopp07]

🎉 This PR is included in version 0.2.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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