feat: add multiline support

[sruehl]

This should fix #6

A new flag is added -multiline which uses multiline variants of the existing headers.

[cla-checker-service]

💚 CLA has been signed

[elasticmachine]

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• Start Time: 2023-04-06T09:02:52.706+0000

• Duration: 5 min 48 sec

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• Description: approval-list/elastic/go-licenser.yml

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• Description: githubApiCall: The REST API call https://api.github.com/orgs/elastic/members/sruehl return the message : java.lang.Exception: httpRequest: Failure connecting to the service https://api.github.com/orgs/elastic/members/sruehl : httpRequest: Failure connecting to the service https://api.github.com/orgs/elastic/members/sruehl : Code: 404Error: {"message":"User does not exist or is not a member of the organization","documentation_url":"https://docs.github.com/rest/reference/orgs#check-organization-membership-for-a-user"}

[jamietanna]

Hey @sruehl thanks very much for this! Apologies we've not seen to this PR yet, is it still something you'd like to get over the line?

[sruehl]

sure