Update Python and GO SDK version (Azure#15610)

* Update Python SDK version

* Remove preview api version for GO sdk

* Add back GO package package-2020-12-01-preview

Author: annoakes

specification/purview/resource-manager/readme.python.md

@@ -10,7 +10,7 @@ azure-arm: true
 license-header: MICROSOFT_MIT_NO_VERSION
 namespace: azure.mgmt.purview
 package-name: azure-mgmt-purview
-package-version: 1.0.0b1
+package-version: 1.0.1
 clear-output-folder: true
 ```
 ``` yaml $(python) && $(python-mode) == 'update' && $(track2)