docs: update upgrade guide to v2 (#274)

Author: vdusek

CHANGELOG.md

@@ -6,7 +6,7 @@
 
 ## [2.0.0](../../releases/tag/v2.0.0) - 2024-09-10
 
-- Check the [Upgrading to v2.0](https://docs.apify.com/sdk/python/docs/upgrading/upgrading-to-v20) guide.
+- Check the [Upgrading to v2.0](https://docs.apify.com/sdk/python/docs/upgrading/upgrading-to-v2) guide.
 
 ### 🚀 Features
 

docs/04-upgrading/upgrading_to_v20.md renamed to docs/04-upgrading/upgrading_to_v2.md

@@ -1,10 +1,14 @@
 ---
-id: upgrading-to-v20
-title: Upgrading to v2.0
+id: upgrading-to-v2
+title: Upgrading to v2
 ---
 
 This page summarizes most of the breaking changes between Apify Python SDK v1.x and v2.0.
 
+## Python version support
+
+Support for Python 3.8 has been dropped. The Apify Python SDK v2.x now requires Python 3.9 or later. Make sure your environment is running a compatible version before upgrading.
+
 ## Storages
 
 The SDK now uses [crawlee](https://github.com/apify/crawlee-python) for local storage emulation. This change should not affect intended usage (working with `Dataset`, `KeyValueStore` and `RequestQueue` classes from the `apify.storages` module or using the shortcuts exposed by the `Actor` class) in any way.