[formrecognizer] fix readme version
@@ -33,7 +33,7 @@ This table shows the relationship between SDK versions and supported API version
|SDK version|Supported API version of service
|-|-
|3.0.0 - Latest GA release (can be installed by removing the `--pre` flag)| 2.0
-|3.1.0b1 - Latest release (beta)| 2.0, 2.1-preview
+|3.1.0b2 - Latest release (beta)| 2.0, 2.1-preview
#### Create a Form Recognizer resource
