Improve unit test spec file filtering

[bahmutov]

right now one can get empty unit test coverage IF the specs and the source files are in the same folder. Take an application where specs and source files are mixed in the same folder "src"

integrationFolder: src
testFiles: **/*spec.js
supportFile: ./support.js

Since we compare against prefix, all files are eliminated.

[bahmutov]

🎉 This issue has been resolved in version 2.0.2 🎉

The release is available on:

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

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