docs: fix README example import to use /v2 path

[gandalf-at-lerian]

Fix the example import in the README to include the /v2 module suffix on line 70.

Module path is github.com/LerianStudio/lib-observability/v2, so the middleware import must be github.com/LerianStudio/lib-observability/v2/middleware.

Requested by: Rodrigo Schieck — corrigir import de exemplo no README para /v2 antes do major release

[coderabbitai]

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• README.md

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📝 Walkthrough

Walkthrough

The README custom application metrics example updates its Go middleware import from the non-v2 module path to the /v2/middleware path.

Changes

README Import Update

Layer / File(s)	Summary
Update custom-metrics example import README.md	The example now imports middleware from github.com/LerianStudio/lib-observability/v2/middleware.

Possibly related PRs

• LerianStudio/lib-observability#27: Introduces the broader /v2 module migration referenced by the README update.
• LerianStudio/lib-observability#31: Migrates middleware packages to the v2 module path.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/readme-v2-import

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[lerian-studio]

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