Fix the double plugin bug

[fatfisz]

This reverts the change in 2171200, because it si not covered by any tests. If getRealPath should handle unparsed options, then I'd at least like to add some tests.

[tleunen]

I agree the default shouldn't be there, pluginOpts. regExps should always be an array if the code run inside manipulateOptions.

Have you found why the plugin fails for a few people? I didn't get a chance to take a deeper look yet.

[fatfisz]

I've posted a comment in the bug thread with more details.

The debugging was a bit tedious, lasted a few hours, but at least now I can go to sleep with less worries. G'night :)

[codecov]

Codecov Report

Merging #146 into master will not change coverage.
The diff coverage is 100%.

Impacted Files	Coverage Δ
src/index.js	100% <100%> (ø)	⬆️
src/getRealPath.js	100% <100%> (ø)	⬆️

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[tleunen]

Thank you so much for the investigation and the help on this one!

[fatfisz]

This fixes #148.