Update Python SDK Version to 1.19.0b2 (Azure#1430)

* Update Python SDK Version to 1.19.0b2 * Update setup.py * Update setup.py --------- Co-authored-by: AzureFunctionsPython <funcdisc@microsoft.com>

Author: gavin-aguiar

setup.py

@@ -105,7 +105,7 @@
  "azure_functions_worker._thirdparty",
 ]
 
-INSTALL_REQUIRES = ["azure-functions==1.19.0b1", "python-dateutil~=2.8.2"]
+INSTALL_REQUIRES = ["azure-functions==1.19.0b2"]
 
 if sys.version_info[:2] == (3, 7):
  INSTALL_REQUIRES.extend(
@@ -143,6 +143,7 @@
  "pandas",
  "numpy",
  "pre-commit",
+ "python-dateutil~=2.8.2"
  ]
 }