🔖 release version 0.9.6 (#106)

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> ## TL;DR
> This pull request updates the version of the Python Rebalancer (pyrb) project from 0.9.5 to 0.9.6 in the `pyproject.toml` file.
> 
> ## What changed
> The only change in this pull request is the version number of the project. The version has been incremented from 0.9.5 to 0.9.6.
> 
> ```diff
>  [tool.poetry]
>  name = "pyrb"
> -version = "0.9.5"
> +version = "0.9.6"
>  description = "Python Rebalancer"
>  authors = ["Minki Kim <[email protected]>"]
>  readme = "README.md"
> ```
> 
> ## How to test
> Since this is a simple version update, no specific testing is required. However, you can verify the change by checking the `pyproject.toml` file and confirming that the version number is now 0.9.6.
> 
> ## Why make this change
> This change is necessary to reflect the new version of the project. This could be due to various reasons such as new features, bug fixes, or other improvements in the project. Updating the version number helps in maintaining the version history and tracking changes in the project.
</details>

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pyrb"
-version = "0.9.5"
+version = "0.9.6"
 description = "Python Rebalancer"
 authors = ["Minki Kim <[email protected]>"]
 readme = "README.md"