fix: could not configure the pattern

[Sy1v4in]

Transmit the configured pattern (through the options) to the Processor in order to process exactly the files defined by this supplied pattern.

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@jenseng I think you should just apply this PR. It solves the issue in a simple way. Yes it's less flexible and does not support multiple processors, but it does solve a real problem with 18nliner without having to resort to writing plugins. I applied this fix in my fork and it does the job as promised.

Also, if you are working on it anyway 😄 why not add .jsx by default? It will make new user's life easier at virtually no cost.