What does this PR change?

• updated changelog for v0.1.5 release

Does the PR depend on any other PRs or Issues? If yes, please list them.

Checklist

I confirm, that I have...

• Read and followed the contributing guide in CONTRIBUTING.md
• Added tests for this PR
• Formatted the code using go fmt (if applicable)
• Updated documentation on the Paralus docs site (if applicable)
• Updated CHANGELOG.md