chore: Bump version to 0.31.0b1 for tls feature (#820)

* chore: Bump version to 0.31.0b1 for tls feature

* tewak versioning

---------

Co-authored-by: Yuelin Zhao <yuelinzhao@microsoft.com>

Author: cheatsheet1999

azext_iot/constants.py

@@ -7,7 +7,7 @@
 
 import os
 
-VERSION = "0.30.0b2"
+VERSION = "0.31.0b1"
 EXTENSION_NAME = "azure-iot"
 EXTENSION_ROOT = os.path.dirname(os.path.abspath(__file__))
 EXTENSION_CONFIG_ROOT_KEY = "iotext"