Update Python SDK Version to 1.7.1 (#856)

Co-authored-by: AzureFunctionsPython <funcdisc@microsoft.com>

Author: Hazhzeng

setup.py

@@ -393,7 +393,7 @@ def run(self):
     ],
     extras_require={
         'dev': [
-            'azure-functions==1.7.0',
+            'azure-functions==1.7.1',
             'azure-eventhub~=5.1.0',
             'python-dateutil~=2.8.1',
             'flake8~=3.7.9',