Added support for service.version

[tobiasstadler]

See #132. For the reference, I did not have a look at the implementation in #132.

[tobiasstadler]

@eyalkoren I will add support for it in the agent once this is released.

[apmmachine]

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• Start Time: 2022-04-28T04:35:04.980+0000

• Duration: 7 min 13 sec

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Passed	232
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Total	232

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[tobiasstadler]

@eyalkoren Would you please have a look?

[tobiasstadler]

ping

[eyalkoren]

@tobiasstadler sorry, we are quite overloaded atm, I hope we have a chance to get to this and additional ecs-logging stuff soon enough 🙏

[eyalkoren]

@tobiasstadler Apologies for the long wait 🙏
Few very minor comments.
Please just bring up to date, then we'll test and merge.
Thanks for your patience!

[tobiasstadler]

Thank You!