Update a note for installing Python SDK on Databricks Runtime 13.1+ (#474)

## Changes
This PR includes the latest note for installing the SDK when using
Databricks Runtime 13.1 and above
(https://databricks-sdk-py.readthedocs.io/en/latest/getting-started.html#installation)

## Tests
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- [ ] `make test` run locally
- [ ] `make fmt` applied
- [ ] relevant integration tests applied

Signed-off-by: Pawarit Laosunthara <[email protected]>

Author: PawaritL

README.md

@@ -44,8 +44,17 @@ for c in w.clusters.list():
     print(c.cluster_name)
 ```
 
-Databricks SDK for Python is compatible with Python 3.7 _(until [June 2023](https://devguide.python.org/versions/))_, 3.8, 3.9, 3.10, and 3.11.
+Databricks SDK for Python is compatible with Python 3.7 _(until [June 2023](https://devguide.python.org/versions/))_, 3.8, 3.9, 3.10, and 3.11.  
+**Note:** Databricks Runtime starting from version 13.1 includes a bundled version of the Python SDK.  
+It is highly recommended to upgrade to the latest version which you can do by running the following in a notebook cell:
 
+```python
+%pip install --upgrade databricks-sdk
+```
+followed by
+```python
+dbutils.library.restartPython()
+```
 ## Code examples<a id="code-examples"></a>
 
 The Databricks SDK for Python comes with a number of examples demonstrating how to use the library for various common use-cases, including