🔖 release version 0.9.7 (#110)

### TL;DR

This change bumps the package version from 0.9.6 to 0.9.7.

### What changed?

The version number in `pyproject.toml` is increased.

### How to test?

After merging the PR, check that the new version is correctly reflected on the package delivery platforms.

### Why make this change?

A new version release is justified by recent changes to our codebase.

---

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pyrb"
-version = "0.9.6"
+version = "0.9.7"
 description = "Python Rebalancer"
 authors = ["Minki Kim <[email protected]>"]
 readme = "README.md"