The lifespan_context object here is not a dictionary like the other e… (#1002)

Co-authored-by: ihrpr <inna@anthropic.com>

Author: johnbikes

README.md

@@ -204,7 +204,7 @@ mcp = FastMCP("My App", lifespan=app_lifespan)
 def query_db() -> str:
     """Tool that uses initialized resources"""
     ctx = mcp.get_context()
-    db = ctx.request_context.lifespan_context["db"]
+    db = ctx.request_context.lifespan_context.db
     return db.query()
 ```