bump: version 1.5.0 → 1.6.0

[anasstahr]

Summary

Changes

• Bump version from 1.5.0 to 1.6.0
• Update CHANGELOG.md with v1.6.0 release notes

User experience

No user-facing UX change. This release includes:

• Added: Per-call AWS profile override middleware for dynamic credential switching (feat(auth): add per-call AWS profile override middleware #266)
• Fixed: Always read fresh credentials from disk on every request (fix: always read fresh credentials from disk on every request #294)
• Fixed: Prevent credential_process hang on Windows in stdio transport mode (fix: prevent credential_process hang on Windows in stdio transport mode #293)

Checklist

• I have reviewed the contributing guidelines
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change? (Y/N)

• Yes
• No

Please add details about how this change was tested.

• Did integration tests succeed?
• If the feature is a new use case, is it necessary to add a new integration test case?

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.