Bump version to 2.2.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: michaelchu

setup.py

@@ -5,7 +5,7 @@
     description="A nimble backtesting and statistics library for options strategies",
     long_description=open("README.md").read(),
     long_description_content_type="text/markdown",
-    version="2.1.0",
+    version="2.2.0",
     url="https://github.com/michaelchu/optopsy",
     author="Michael Chu",
     author_email="mchchu88@gmail.com",