README: update info about version with httpx to 5.3.1b1

README.md

@@ -29,7 +29,7 @@ pip install -U duckduckgo_search
 ```
 There is also a beta release that uses the `httpx` library:
 ```python
-pip install -U duckduckgo_search==5.3.0b4
+pip install -U duckduckgo_search==5.3.1b1
 ```
 > [!NOTE]
 > you can install lxml to use the `text` function with `backend='html'` or `backend='lite'` (size ≈ 12Mb)</br>