chore: update README

Signed-off-by: Jan Vollmer <jan@vllmr.dev>

Author: jvllmr

README.md

@@ -7,7 +7,7 @@
 
 SQLAlchemy load option that loads from persisted session instances.
 
-Supports SQLAlchemy 1.4
+The goal of this load option is to achieve performance gains in specific use-cases by not querying the database or serializing new objects and reading from cache instead. This means that you as a user need to make sure before that all of the objects you expect to find within a query are already present the session store. Use with care!
 
 ## Basic usage