Update example and readme

[mikakruschel]

Hey there, thanks for making Diagnostics public, I think it's a cool way to debug apps in production.
I saw that you had a discussion about whether to use an optional array or just an empty array (e75d7e4) and decided to go the non-optional way. It seems though that you forgot to change the example, so that's what this pull request is.

[BasThomas]

Thanks, @mikakruschel! I don't really understand, however. We (for now) went for making it optional, and that is reflected in the example. You now changed both the implementation and the example?

[mikakruschel]

As you can in the commit e75d7e4 and this line:
https://github.com/WeTransfer/Diagnostics/blob/99e791c69fbea21f228a1bf59bcef1185d5c94bc/Sources/SmartInsights/SmartInsightsProviding.swift#L15
you decided against making it optional. This is why the example is currently not working. All I did was to fix the example.

[BasThomas]

Oh 😅, seems like I missed that. Thanks!

[AvdLee]

Ah, yeah, completely forgot about updating the example and readme. Thanks a ton for this! 💪

[wetransferplatform]

	Fails
🚫	Build service could not create build operation: internal error: could not generate PIF because the workspace has not finished loading or is still waiting for package resolution

	Messages
📖	View more details on Bitrise
📖	DiagnosticsTests: Executed 30 tests (0 failed, 0 retried, 0 skipped) in 0.466 seconds

Code Coverage Report

Name	Coverage
Diagnostics	75.64%	⚠️

Generated by 🚫 Danger Swift against fc28bed

[wetransferplatform]

Congratulations! 🎉 This was released as part of Release 4.0.0 🚀

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