add license to bash script

[aspacca]

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[elasticmachine]

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[endorama]

I'd like to suggest an alternative: https://github.com/elastic/go-licenser

Is the tool in use in beats and I think would be a better choice in the long run.

[aspacca]

@endorama when I created the project https://github.com/elastic/go-licenser didn't support Elastic 2.0, that's the reason I wrote an ad hoc script

I see now it supports it, but It still has the problem that it puts the license before the shebang in bash :(

[endorama]

Looking at go-licenser source it clearly does not support anything that is not Go code, so this solutions works for me. Meanwhile I opened an issue to discuss possible expansion of file support.