Update README.md

Add update of data

Author: alif-arrizqy

README.md

@@ -140,6 +140,17 @@ data = supabase.table("countries").select("*").execute()
 assert len(data.get("data", [])) > 0
 ```
 
+#### Update of Data
+
+```python
+from supabase import create_client, Client
+
+url: str = os.environ.get("SUPABASE_TEST_URL")
+key: str = os.environ.get("SUPABASE_TEST_KEY")
+supabase: Client = create_client(url, key)
+data = supabase.table("countries").update({"country": "Indonesia", "capital_city": "Jakarta"}).eq("id", "1").execute()
+```
+
 ## Realtime Changes
 
 ```python